Database Develop

Can't recover my N1

this is what i tried to do: wanted to flash a new rom from my original froyo. read through the guide and got it rooted and installed rom manager and in turn installed recovery. booted into recovery and made a backup. tried installing a rom but it wouldnt let me so at the end installed RA recovery instead. i was able to flash a different rom. mpw tried to boot to recovery to get stock rom it display just the android and exlamation mark.
i can get into bootloader but in recovery wont show a thing as if it lost the recovery program.
tried installing sdk but adb wont see the phone.
SDK version 9, windows vista
Any ideas?

You have the stock recovery...
Read the wiki. Follow the guide for unroot/restore, using passimg method and FRG33. Start again rooting (though you probably want to read a bit more first, and make sure you can connect via adb and fastboot BEFORE you mess with stuff)...
Sent from my Nexus One using XDA App

issue is i cant connect through adb or fastboot since i dont have the debug mode before it all went

You don't need adb or fastboot to follow the unroot/restore guide. I was simply suggesting that you make sure it works before you try and root again.
Unroot/restore.
Get adb and fastboot working.
Play with phone.
Sent from my Nexus One using XDA App

how can i get adb/fastboot working. i went through the guide and dozens of other websites.
adb doesnt see a phone connected even though under device manager it shows an android device.

Install the drivers when in fastboot mode, and you'll have fastboot. It's not adb.
fastboot won't help you unless your bootloader is unlocked. adb you won't get, unless you install a ROM and enable debug, or install a custom recovery - which, again, you won't be able to install without unlocked bootloader. adb doesn't work in bootloader mode, you should have found that in at least one of the "dozen guides".
So, you have 2 options:
1) you have unlocked bootloader or you want to unlock bootloader - in that case, enter the bootloader, connect usb, install fastboot drivers, install custom recovery with fastboot.
2) you don't want to unlock bootloader - then follow the correct advice given to you in danger-rat's posts above.

So, you have 2 options:
1) you have unlocked bootloader or you want to unlock bootloader - in that case, enter the bootloader, connect usb, install fastboot drivers, install custom recovery with fastboot.
2) you don't want to unlock bootloader - then follow the correct advice given to you in danger-rat's posts above.[/QUOTE]
ok problem solved and thanks. all along the dll file for fastboot was in platform-tools instead of tool within the sdk hence why fastboot never worked. unlocked the bootloader and recovered my old image. incase anyone else have this issue.
thanks

[Q] Verizon Developers Edition help

Hoping somebody can help me figure out what is going on with my phone. Sorry for the long post, but hoping folks with custom rom and flashing experience will read on to help.
I have the Verizon Developer Edition. I have unlocked the bootloader, installed TWRP 2.7, and rooted the phone. I have never installed any custom ROMs on the phone. I had done custom ROMs on my GS3, but I just wanted this phone rooted, and maybe mess around with a few ROMs down the road.
I followed this video from RootJunky when I originally installed TWRP.
So a few weeks ago I kept getting the OTA message to upgrade to the latest kitkat. I decided to flash back to the original recovery so I could do the upgrade. I contacted RootJunky on his youtube channel and he provided a link to the stock recovery and I flashed it using the same video and his linked file.
After flashing the stock recovery, when I was in bootloader mode, I scrolled down to "recovery" and selected it. It would not go into recovery. It just stays in a bootloop. I went back and forth with RootJunky a few times trying to resolve this, but I got no response to my last few comments.
I can get the phone back into bootloader mode by holding the volume up/dwn and power buttons, if I time it correctly during the bootloop. When in bootloader mode, I can select "Normal Powerup" option and the phone will boot up and function properly. But, if I shut the phone down, I can't turn the device on with the power button, otherwise it will just bootloop. I have to get into bootloader mode, then select "Normal Powerup" to get the phone to work.
Once back in the phone, my USB debugging option is unchecked. I can recheck it, open a command prompt, and do a "adb devices" and it shows it connected. But if I do a "adb reboot bootloader" from the command prompt it will bootloop.
When I get into bootloader mode manually, when I connect it to the computer, and do a "adb devices", it doesn't show as connected, as I think the USB debugging option is getting toggled off somehow, so I can't connect or flash anything to the phone at this point.
One thing I see, in the video @ 4:50, he says you need to be at "status code 1" to flash recoveries. I am/was at status code 3. Not sure if that is why I am having this issue, or how to get this changed.
Any help would be greatly appreciated. I can use the phone just fine, but at this point, I would just like to be able to do a full restore to stock, upgrade to 4.4.4, keep the unlocked bootloader, and root the phone. No custom ROM.
THANKS!

08G8V8 said:
Hoping somebody can help me figure out what is going on with my phone. Sorry for the long post, but hoping folks with custom rom and flashing experience will read on to help.
I have the Verizon Developer Edition. I have unlocked the bootloader, installed TWRP 2.7, and rooted the phone. I have never installed any custom ROMs on the phone. I had done custom ROMs on my GS3, but I just wanted this phone rooted, and maybe mess around with a few ROMs down the road.
I followed this video from RootJunky when I originally installed TWRP.
So a few weeks ago I kept getting the OTA message to upgrade to the latest kitkat. I decided to flash back to the original recovery so I could do the upgrade. I contacted RootJunky on his youtube channel and he provided a link to the stock recovery and I flashed it using the same video and his linked file.
After flashing the stock recovery, when I was in bootloader mode, I scrolled down to "recovery" and selected it. It would not go into recovery. It just stays in a bootloop. I went back and forth with RootJunky a few times trying to resolve this, but I got no response to my last few comments.
I can get the phone back into bootloader mode by holding the volume up/dwn and power buttons, if I time it correctly during the bootloop. When in bootloader mode, I can select "Normal Powerup" option and the phone will boot up and function properly. But, if I shut the phone down, I can't turn the device on with the power button, otherwise it will just bootloop. I have to get into bootloader mode, then select "Normal Powerup" to get the phone to work.
Once back in the phone, my USB debugging option is unchecked. I can recheck it, open a command prompt, and do a "adb devices" and it shows it connected. But if I do a "adb reboot bootloader" from the command prompt it will bootloop.
When I get into bootloader mode manually, when I connect it to the computer, and do a "adb devices", it doesn't show as connected, as I think the USB debugging option is getting toggled off somehow, so I can't connect or flash anything to the phone at this point.
One thing I see, in the video @ 4:50, he says you need to be at "status code 1" to flash recoveries. I am/was at status code 3. Not sure if that is why I am having this issue, or how to get this changed.
Any help would be greatly appreciated. I can use the phone just fine, but at this point, I would just like to be able to do a full restore to stock, upgrade to 4.4.4, keep the unlocked bootloader, and root the phone. No custom ROM.
THANKS!
Click to expand...
Click to collapse
First, Status code 3 is normal - that indicates an unlocked bootloader.
You should be able to use the 4.4.4 FXZ to flash back to 100% stock. Afterwards, you can flash TWRP, and re-root. Use the latest TWRP from here: http://techerrata.com/browse/twrp2/ghost
The important thing about TWRP is that immediately after flashing it, you have to "fastboot reboot-bootloader" and immediately boot into recovery - otherwise it doesn't 'stick'. We don't know why, but as long as you do it that way, you will be fine.
Here is the link for the 4.4.4 FXZ: http://forum.xda-developers.com/moto-x/general/fxz-moto-x-4-4-4-212-55-26-t2827307
If you follow the instructions, you will be on stock, rooted 4.4.4 in less than 20 minutes.
Good Luck, and let me know if you need additional assistance :good:
Also, please remember to post your questions to Q&A - not General. Don't worry as I have already requested that the Mods move it to the appropriate sub-forum.
EDIT: The problem I see with "rootjunky"s video is that first, he advises that "Status code 1" is required to flash recovery -- this is incorrect. Status code 3 works fine for custom recovery.
Additionally, he did not "fastboot reboot-bootloader" before booting into recovery. This is necessary. I'm not sure why he left that step out....likely he already had custom recovery flashed when he made the video.

Thanks for the quick response. Sorry about posting in the wrong section. I should have known better.....
I will look at this, but probably won't do it until after work tomorrow. I will post back tomorrow, hopefully with success.
Thanks!

I saw your edit to your post. I did the reboot boot loader step when I originally flashed twrp. I can't remember where I saw it, but I remember reading it and doing it.
The phone was running fine with twrp installed for a few months. The problem I am having now happened after flashing the stock recovery back onto the phone.
Do you recommend the RSD Flasher or House of Moto method to flash this FXZ?

08G8V8 said:
I saw your edit to your post. I did the reboot boot loader step when I originally flashed twrp. I can't remember where I saw it, but I remember reading it and doing it.
The phone was running fine with twrp installed for a few months. The problem I am having now happened after flashing the stock recovery back onto the phone.
Do you recommend the RSD Flasher or House of Moto method to flash this FXZ?
Click to expand...
Click to collapse
Either will work fine. If you don't care about keeping your data, you can use RSD Lite (will wipe everything). If you use one of the tools in the thread I linked you to, make absolutely sure you follow the instructions -- you can't have any spaces in any folder-names. If you use RSD Lite, you just select the zip file and flash (no worries about directory structure).

Ok, I just assumed those were the methods to flash it. I will look into the RSD Lite method, as if don't mind wiping the data.

I just watched a quick video on YouTube about using RSD Lite, and they state you must reboot the boot loader and do the flash in fastboot. I can't reboot into the bootloader from the command prompt, as it goes into the boot loop. I can get into fastboot manually, but when connecting to the computer it doesn't recognize it since the USB debugging option keeps getting reset on me.
Am I missing something? I don't see how I can flash this.

08G8V8 said:
I just watched a quick video on YouTube about using RSD Lite, and they state you must reboot the boot loader and do the flash in fastboot. I can't reboot into the bootloader from the command prompt, as it goes into the boot loop. I can get into fastboot manually, but when connecting to the computer it doesn't recognize it since the USB debugging option keeps getting reset on me.
Am I missing something? I don't see how I can flash this.
Click to expand...
Click to collapse
So you are telling me that when you type "adb reboot bootloader" (if usb debugging is enabled) or "fastboot reboot-bootloader" (if usb debugging is not enabled) it doesn't take you to the "AP Fastboot Mode" screen?

samwathegreat said:
So you are telling me that when you type "adb reboot bootloader" (if usb debugging is enabled) or "fastboot reboot-bootloader" (if usb debugging is not enabled) it doesn't take you to the "AP Fastboot Mode" screen?
Click to expand...
Click to collapse
Sorry, the "adb reboot bootloader" sends me into the bootloop.
I hadn't tried the "fastboot reboot bootloader" or "fastboot reboot-bootloader". Now when I try that, with USB debugging checked I just get "<waiting for device>" It does nothing.

What about turning off the device. Then holding power button and volume down at the same time. Does it take you to the bootloader screen like it should?

It sounds to me like when you were attempting you flash your stock recovery back, you flashed it to the wrong partition. I've seen another member do this....
He accidentally typed "fastboot flash bootloader stockrecoveryfile.img"
That would cause the issues you are describing... I might have a way to fix it if you are currently still rooted and able to access adb...

Travisdroidx2 said:
What about turning off the device. Then holding power button and volume down at the same time. Does it take you to the bootloader screen like it should?
Click to expand...
Click to collapse
Yes, I can manually get into bootloader, but it keeps toggling my USB debugging option, so when I connect it to the computer, it doesn't see it.

08G8V8 said:
Yes, I can manually get into bootloader, but it keeps toggling my USB debugging option, so when I connect it to the computer, it doesn't see it.
Click to expand...
Click to collapse
USB debugging isn't used in the bootloader, and adb isn't used for fastboot mode... I'm very confused by what you are saying...

Once you are in the boot loader screen does "fastboot devices" recognize your device?

samwathegreat said:
It sounds to me like when you were attempting you flash your stock recovery back, you flashed it to the wrong partition. I've seen another member do this....
He accidentally typed "fastboot flash bootloader stockrecoveryfile.img"
That would cause the issues you are describing... I might have a way to fix it if you are currently still rooted and able to access adb...
Click to expand...
Click to collapse
No, I typed "fastboot flash recovery stockrecoveryfile.img"
I did just like originally when flashing TWRP, just replaced the file in the command line.
I am still rooted.
samwathegreat said:
USB debugging isn't used in the bootloader, and adb isn't used for fastboot mode... I'm very confused by what you are saying...
Click to expand...
Click to collapse
I can get into fastboot with the phone powered off, holding the volume UP/DWN and PWR. But when connected to the computer it isn't recognized.
Sorry, but I am confused as well. I am just going off what I have seen in RootJunky's videos. In this video, https://www.youtube.com/watch?v=1LkuLb8hV6Q#t=285 at 4:44, after he does the "adb reboot bootloader" he says the device is now in "bootloader mode" which is what I am talking about, but I guess is actually Fastboot Mode. This is the same mode I am talking about getting into from the device powered off holding the volume UP/DWN and PWR buttons, but going in this way doesn't get recognized by the computer.

Travisdroidx2 said:
Once you are in the boot loader screen does "fastboot devices" recognize your device?
Click to expand...
Click to collapse
YES it does! Thanks. I kept trying "adb devices", and when it wasn't recognizing it, I figured it wasn't connected. I wasn't doing "fastboot devices". But, my USB debugging still was getting unchecked after getting back into the phone.
So with it recognizing my device in fastboot mode I should be able to go ahead with the RSD Lite flashing?

08G8V8 said:
No, I typed "fastboot flash recovery stockrecoveryfile.img"
I did just like originally when flashing TWRP, just replaced the file in the command line.
I am still rooted.
I can get into fastboot with the phone powered off, holding the volume UP/DWN and PWR. But when connected to the computer it isn't recognized.
Sorry, but I am confused as well. I am just going off what I have seen in RootJunky's videos. In this video, https://www.youtube.com/watch?v=1LkuLb8hV6Q#t=285 at 4:44, after he does the "adb reboot bootloader" he says the device is now in "bootloader mode" which is what I am talking about, but I guess is actually Fastboot Mode. This is the same mode I am talking about getting into from the device powered off holding the volume UP/DWN and PWR buttons, but going in this way doesn't get recognized by the computer.
Click to expand...
Click to collapse
OK, glad you didn't flash to bootloader. That is tricky to fix...but I've dealt with people who have done it before.
Try another PC...or re-install the drivers. Also, DO NOT use a usb 3.0 port, always use 2.0.
Bootloader = AP fastboot mode. They are one and the same. Try to get it recognized with "fastboot devices", on any PC. If you can get to that point, you can flash back to stock and recover everything. The FXZ can actually FIX a corrupted or damaged filesystem. It replaces all the relevant partitions.
Remember you do NOT use adb or usb debugging. They have nothing to do with fastboot.
---------- Post added at 09:10 PM ---------- Previous post was at 09:09 PM ----------
08G8V8 said:
YES it does! Thanks. I kept trying "adb devices", and when it wasn't recognizing it, I figured it wasn't connected. I wasn't doing "fastboot devices". But, my USB debugging still was getting unchecked after getting back into the phone.
So with it recognizing my device in fastboot mode I should be able to go ahead with the RSD Lite flashing?
Click to expand...
Click to collapse
YES!!!!
It seems you were confusing adb and fastboot. As long as "fastboot devices" recognizes your device, SO WILL RSD LITE!!!
Now follow my initial instrucitons, and you will be up and running in no time...

Thanks guys! I am going to do this tomorrow, but I feel pretty good that it is going to work.
Yes, I got VERY confused, and definitely need to go study up some more. I thought I had it, but obviously not.
Will report back tomorrow.

Happy to help

Absolutely get the Dev Edition for the same price. While Safestrap is out for other Galaxy devices with locked bootloaders (not sure if the S5 got SS yet) it allows customs Roms....but not kernel changes. With a Dev edition, there may be less development, but I'm sure there will still be some development out there.

How to Re-Lock Bootloader?

I need to lock my bootloader to do an exchange at T-Mobile. I have 20R stock flashed, but it still says custom bootloader upon boot, how do I relock it safely?
I read that "fastboot oem lock" will work, but will brick it if I don't do it perfectly. Any advice on what to do?

TechGuruGJ said:
I need to lock my bootloader to do an exchange at T-Mobile. I have 20R stock flashed, but it still says custom bootloader upon boot, how do I relock it safely?
I read that "fastboot oem lock" will work, but will brick it if I don't do it perfectly. Any advice on what to do?
Click to expand...
Click to collapse
ive done it .. it works. it will build dalvik once it reboots.
I was able to Lock the bootloader.
1. I connected the phone to my PC
2. Powered on the Phone (it took a few tried of pulling the battery and powering on)
3. Check the box for OEM Unlock in Dev. Option
4. Use Minimal ADB and Fastboot and type in
Quote:
adb devicecs
- you should see the phone listed as one of the devices in the command line window
Quote:
adb reboot bootloader
- phone should reboot and you shouold see 3 lines of text on top
Quote:
fastboot oem lock
- nothing will happen on the phone, but on in the commandline it should say that it is done
Quote:
fastboot reboot
Phone reboots and the boot screen does not show the unlocked bootloader message anymore

I'm terribly sorry if bumping is not ok.
Thought it wasn't worth making a new thread, since my post is about the one above.
Has anybody actually tried these steps above? (Since every other thread mentioning this says it's a one-way only thing..)
Does locking the bootloader means also loosing the custom recovery? (I'd expect that, but asking to be sure)
Does it return the phone to it's original state? (ie. before one unlocked the bootloader, or there are some differences?)
Does it also means I would be able to get official OTA updates and so on? (since with a custom recovery, that's not possible)
Thanks in advance.

Yes, it does work. I did it, worked perfectly. Yes it does return your device to it's original state. Just make sure the stock ROM is flashed and all should be well. I didn't try, but I see no reason why it wouldn't let you get OTA updates from T-Mobile. Let me know if you need help.

Nadeox1 said:
I'm terribly sorry if bumping is not ok.
Thought it wasn't worth making a new thread, since my post is about the one above.
Has anybody actually tried these steps above? (Since every other thread mentioning this says it's a one-way only thing..)
Does locking the bootloader means also loosing the custom recovery? (I'd expect that, but asking to be sure)
Does it return the phone to it's original state? (ie. before one unlocked the bootloader, or there are some differences?)
Does it also means I would be able to get official OTA updates and so on? (since with a custom recovery, that's not possible)
Thanks in advance.
Click to expand...
Click to collapse
ive said ive done it. on the above instructions you dont beleive.??
i think you loose the twrp phone doesnt show unlocked bootloader message did not check recovery but it must revert t stock one.. not sure about OTA since am not in tmobile network.
you dont need OTA. you can always download KDZ and flash it with LGUP.
and stay uptodate.

raptorddd said:
ive said ive done it. on the above instructions you dont beleive.??
i think you loose the twrp phone doesnt show unlocked bootloader message did not check recovery but it must revert t stock one.. not sure about OTA since am not in tmobile network.
you dont need OTA. you can always download KDZ and flash it with LGUP.
and stay uptodate.
Click to expand...
Click to collapse
Thanks both for replying.
And no @raptorddd , I did not mean that.
Your post is the only mentioning that locking the bootloader is possible, while all the other similar threads have ony people saying otherwise / it's not possible. I guess a slightly doubt is legit to have, don't take it wrongly

raptorddd said:
ive done it .. it works. it will build dalvik once it reboots.
I was able to Lock the bootloader.
1. I connected the phone to my PC
2. Powered on the Phone (it took a few tried of pulling the battery and powering on)
3. Check the box for OEM Unlock in Dev. Option
4. Use Minimal ADB and Fastboot and type in
Quote:
adb devicecs
- you should see the phone listed as one of the devices in the command line window
Quote:
adb reboot bootloader
- phone should reboot and you shouold see 3 lines of text on top
Quote:
fastboot oem lock
- nothing will happen on the phone, but on in the commandline it should say that it is done
Quote:
fastboot reboot
Phone reboots and the boot screen does not show the unlocked bootloader message anymore
Click to expand...
Click to collapse
I have follow this instructions and now it giving me and error. Any fix??

WARMANH811 said:
I have follow this instructions and now it giving me and error. Any fix??
Click to expand...
Click to collapse
What error?

TechGuruGJ said:
What error?
Click to expand...
Click to collapse
Secure booting Error!
Error code: 1003
MODIFIED ! !

WARMANH811 said:
Secure booting Error!
Error code: 1003
MODIFIED ! !
Click to expand...
Click to collapse
are you sure you have h811.? i did not get that error ive tried this twice..
i remeber getting an security boot error on LG G2 i fix by flashing firmware .. so maybe KDZ could help..
if not am not sure then search for that error and find out how to fix.

raptorddd said:
ive done it .. it works. it will build dalvik once it reboots.
I was able to Lock the bootloader.
1. I connected the phone to my PC
2. Powered on the Phone (it took a few tried of pulling the battery and powering on)
3. Check the box for OEM Unlock in Dev. Option
4. Use Minimal ADB and Fastboot and type in
Quote:
adb devicecs
- you should see the phone listed as one of the devices in the command line window
Quote:
adb reboot bootloader
- phone should reboot and you shouold see 3 lines of text on top
Quote:
fastboot oem lock
- nothing will happen on the phone, but on in the commandline it should say that it is done
Quote:
fastboot reboot
Phone reboots and the boot screen does not show the unlocked bootloader message anymore
Click to expand...
Click to collapse
My H811 T-mobile phone needs service. It has original 20v software version. It is unlocked with TWRP and rooted. Can I use this method? Do I first have to downgrade software to some other version? Will this method also take out TWRP and root or do I still have to take them out before doing this? How? Please help.

joecandle said:
My H811 T-mobile phone needs service. It has original 20v software version. It is unlocked with TWRP and rooted. Can I use this method? Do I first have to downgrade software to some other version? Will this method also take out TWRP and root or do I still have to take them out before doing this? How? Please help.
Click to expand...
Click to collapse
no need to downgrade. to remove root and any trace if phone works. is to use KDZ then once it boots into system do the lock procedure. so it locks and the small white letter are removed. this way its like stock rom and recovery and the above commmands will make bootloader locked. and sent to repair. if bootloops try the freezing method.

Used on an LG Aristo that has Cyanogen and it worked
raptorddd said:
ive said ive done it. on the above instructions you dont beleive.??
i think you loose the twrp phone doesnt show unlocked bootloader message did not check recovery but it must revert t stock one.. not sure about OTA since am not in tmobile network.
you dont need OTA. you can always download KDZ and flash it with LGUP.
and stay uptodate.
Click to expand...
Click to collapse
This was the only one i found that didnt brick my phone and trust me ive bricked and unbricked this phone many times

When you use the fastboot command to lock back your bootloader, the phone doesn't revert automatically to the stock recovery and actually that is partly the reason why it bricks and other main reason is that changes made to bootloader to obtain root brick the phone. before you relock bootloader, if you have SuperSU (in-app menu option) or Magisk (uninstall zip file), use their respective methods to unroot the phone, then use twrp to flash .image file of stock recovery to recovery partition then use the fastboot command to lock the bootloader. Even then it may or may not work because if whatever method the phone uses to check the integrity of bootloader and/or recovery, such as md5, if it doesn't match, the phone will still brick. Since all your data on phone will be erased regardless as soon as you lock the bootloader, i personally just fastboot lock the bootloader, remove battery to power down, use the volume up and plug usb cable in from pc to put phone in download mode and just use LGUP (uppercut) if have kdz file already, which i do, i just let LG Bridge download the file, find it in programs folder and copy it to another location before LG Bridge deletes it --OR-- just use error recovery option in Software Update tab in LG Bridge as both LGUP and LG Bridge will detect the phone in download mode even if it is bricked.
By the way, I have used both methods above dozens of times without any issues, someone above who mentioned phone boot-looping because of locking the bootloader, it is boot-looping not because of hardware flaw which was widespread in LG G3 but a software issue (phone boots up, doesn't find the software configuration it is looking for and just restarts) and they are not the same issues, no need to freeze the phone, won't help.

the method works, but no OTA from T-Mobile. "verification problem".
When I try to "adb reboot bootloader" I get "security error".
If I try reboot recovery, TWRP is definitely not there.
Just want to update from20Q to 20X.
Any help would be appreciated.

metropical said:
the method works, but no OTA from T-Mobile. "verification problem".
When I try to "adb reboot bootloader" I get "security error".
If I try reboot recovery, TWRP is definitely not there.
Just want to update from20Q to 20X.
Any help would be appreciated.
Click to expand...
Click to collapse
The above points to you not giving permission possibly because either you missed the permission pop-up or selected option that didn't allow permission.

Can anyone help me?
When i unlock bootloader on my lg velvet 4g the fingerprint stop working so i want to relock. But when i put this on cmd "adb reboot bootloader" it only restarts my phone. Doesnt shows me the bootloader menu it only restarts normaly

Lukasz23 said:
Can anyone help me?
When i unlock bootloader on my lg velvet 4g the fingerprint stop working so i want to relock. But when i put this on cmd "adb reboot bootloader" it only restarts my phone. Doesnt shows me the bootloader menu it only restarts normaly
Click to expand...
Click to collapse
managed to solve?

Can't access fastboot mode

I was gifted a Nexus 6 after my 5X died. As far as I know the device has never been OEM unlocked, much less flashed with anything. I've unlocked developer options and allowed USB debugging and OEM unlock but when I try to use power+Vol(-) to get into fastboot mode nothing happens, the screen is just black. When I bridged the device using ADB I could see the serial number and tried using the boot into recovery mode command and it rebooted to the same black screen. When I used fastboot commands on the black screen I could see the device and tried running fastboot oem unlock, it did something but wasn't successful in unlocking it. I'm not prepared to just start running fastboot commands blind like that without being able to see what's happening on the device's screen.
It's a curious problem, has anyone ever heard of it happening before? I can't find anything similar when I google it.
All I really want to do is clear the Dalvik cache and flash the latest factory image because currently, even after doing a factory reset, the device is very slow and laggy.
Is there anyway I could clear all the caches etc without going into fastboot mode or does anyone know of any fixes I could use so I can see the recovery menu?

If you boot to bootloader mode, then "fastboot boot <TWRP.img>" you might be able run twrp on your pc and clear caches. If it works, I'd consider factory resetting. You can get twrp here: https://dl.twrp.me/shamu/

I have considered that. But that requires OEM unlock, no? I still haven't managed to unlock it yet. The first time I tried, I said yes to unlock (it involves using the rocker to select a response, which I can't see the options for) but in the command window it said it failed (can't remember the error message though). I was going to try again today but because I couldn't see the options when I tried it said I'd cancelled the operation and I was too scared to try again in case something went wrong.
But, do you think I should try the fastboot oem unlock command again? I definitely need OEM unlock to install TWRP, right?

connorjolley said:
I have considered that. But that requires OEM unlock, no? I still haven't managed to unlock it yet. The first time I tried, I said yes to unlock (it involves using the rocker to select a response, which I can't see the options for) but in the command window it said it failed (can't remember the error message though). I was going to try again today but because I couldn't see the options when I tried it said I'd cancelled the operation and I was too scared to try again in case something went wrong.
But, do you think I should try the fastboot oem unlock command again? I definitely need OEM unlock to install TWRP, right?
Click to expand...
Click to collapse
To install twrp yes, you need an unlocked bootloader. This doesn't install twrp on the device. I believe it should work. It certainly shouldn't hurt. I've been unlocked since the N6 came out so I can't double check for you.
If it doesn't work, I'd be a bit inclined to just flash a factory image thus ensuring everything is stock and current. You might want to wait for others to chime in, but it's what I would do.

You may consider downloading Nexus Root Toolkit, works like a charm : ).

I can't just flash the stock bootloader without OEM unlock, right?

connorjolley said:
I can't just flash the stock bootloader without OEM unlock, right?
Click to expand...
Click to collapse
Correct, you need to be unlocked to flash a factory image, that includes the bootloader. See Google's instructions. Don't get confused by the "fastboot oem unlock"
vrs "fastboot flashing unlock" we are an older device and use oem unlock. The other is for the 6P and newer devices.

ktmom said:
Correct, you need to be unlocked to flash a factory image, that includes the bootloader. See Google's instructions. Don't get confused by the "fastboot oem unlock"
vrs "fastboot flashing unlock" we are an older device and use oem unlock. The other is for the 6P and newer devices.
Click to expand...
Click to collapse
Successfully unlocked. TWRP didn't help, still can't see the bootloader menu to access the recovery. I'm flashing the factory image now, hopefully a new bootloader will fix it. If not, is there anyway to clear the Dalvik cache using fastboot commands now the phone is unlocked?
UPDATE
Still a black screen even with a new bootloader flash. I'm assuming now this must be a hardware problem

connorjolley said:
Successfully unlocked. TWRP didn't help, still can't see the bootloader menu to access the recovery. I'm flashing the factory image now, hopefully a new bootloader will fix it. If not, is there anyway to clear the Dalvik cache using fastboot commands now the phone is unlocked?
Click to expand...
Click to collapse
I think the command is "fastboot erase cache". Also, unlocking will have wiped the device.

connorjolley said:
UPDATE
Still a black screen even with a new bootloader flash. I'm assuming now this must be a hardware problem
Click to expand...
Click to collapse
Why not just flash the entire factory image you got the bootloader from? What can it hurt? It would be really odd for this to be hardware if you can boot into the ROM and the screen works.

Can somebody please point me in the right direction? (I've searched)

I need to root my G4 on TMO. It's on 6.0 and all I have done is enabled dev options - usb debugging- enable OEM in the menu. I've rooted devices before but it's been awhile. I obviously need to start from the beginning here, I assume by unlocking bootloader. I can't find any thread to start with as they are either outdated or for a different version of Android, or I just couldn't find one. I would really appreciate it if somebody could just link me to the thread/guide I need to be in! Thank you so much if you can!

MTN927 said:
I need to root my G4 on TMO. It's on 6.0 and all I have done is enabled dev options - usb debugging- enable OEM in the menu. I've rooted devices before but it's been awhile. I obviously need to start from the beginning here, I assume by unlocking bootloader. I can't find any thread to start with as they are either outdated or for a different version of Android, or I just couldn't find one. I would really appreciate it if somebody could just link me to the thread/guide I need to be in! Thank you so much if you can!
Click to expand...
Click to collapse
note it can only be unlock in this versions.. ill place them from oldest to newest 20i-(20p-20q-20r-20v) if you in any of the versions in parenthesis doent downgrade tp 20i... 20i is antirollback V2 all other in parenthsis is V3 you can switch bak and forth from 20p-to 20v.
well you have developers option enabled and OEM unlock
minimal adb. fastboot install it follow instructions. https://forum.xda-developers.com/showthread.php?t=2317790
download TWRP from here h811 and h815 same app for both. https://twrp.me/devices/lgg4.html
have 2 copies on in SD card other in minmal adb fastboot folder.
Bootloader OEM Unlock + Root:
Starting with the Android 6.0 20x bootloader it has to be unlocked, sorta like a Nexus, with fastboot. Previously only 'OEM Unlock' had to be toggled in Android Developer settings for TWRP or custom boot images to work.
download superSU
connect usb cable to phone.. then go to location folder of minimal adb.. ezample Crogramfiles/minimal.
then in the folder in a empty space press shift key.. and right click on mouse button . you should see open command prompt from here.. select it.
a new window should appear. enter this command
adb reboot bootloader and see screen for confirmation to acsess phone select yes.
if it doesnt boot into bootloader try command again
once booted youll see small letter on phone screen then enter command
fastboot oem unlock (this wipes ALL data!!)
it should restart phone. and optimize all apps...and bootloader should unlock
do same for twrp.... make sure command name of twrp is the same in the file example command is like this..
fastboot boot twrp-2.8.7.1-h811.img and file TWRP is say.. twrp.30.00 it wont work rename either command or files or both and name it twrp.img same in command. once it boot into twrp .. go to install then press button that says image. so the twrp.img you have in sd card appears/ select it then on next window tick recovery. swipe left to install permanently and you are done. flash new rom or superSU.
hope i make sense good luck

raptorddd said:
note it can only be unlock in this versions.. ill place them from oldest to newest 20i-(20p-20q-20r-20v) if you in any of the versions in parenthesis doent downgrade tp 20i... 20i is antirollback V2 all other in parenthsis is V3 you can switch bak and forth from 20p-to 20v.
well you have developers option enabled and OEM unlock
minimal adb. fastboot install it follow instructions. https://forum.xda-developers.com/showthread.php?t=2317790
download TWRP from here h811 and h815 same app for both. https://twrp.me/devices/lgg4.html
have 2 copies on in SD card other in minmal adb fastboot folder.
Bootloader OEM Unlock + Root:
Starting with the Android 6.0 20x bootloader it has to be unlocked, sorta like a Nexus, with fastboot. Previously only 'OEM Unlock' had to be toggled in Android Developer settings for TWRP or custom boot images to work.
download superSU
connect usb cable to phone.. then go to location folder of minimal adb.. ezample Crogramfiles/minimal.
then in the folder in a empty space press shift key.. and right click on mouse button . you should see open command prompt from here.. select it.
a new window should appear. enter this command
adb reboot bootloader and see screen for confirmation to acsess phone select yes.
if it doesnt boot into bootloader try command again
once booted youll see small letter on phone screen then enter command
fastboot oem unlock (this wipes ALL data!!)
it should restart phone. and optimize all apps...and bootloader should unlock
do same for twrp.... make sure command name of twrp is the same in the file example command is like this..
fastboot boot twrp-2.8.7.1-h811.img and file TWRP is say.. twrp.30.00 it wont work rename either command or files or both and name it twrp.img same in command. once it boot into twrp .. go to install then press button that says image. so the twrp.img you have in sd card appears/ select it then on next window tick recovery. swipe left to install permanently and you are done. flash new rom or superSU.
hope i make sense good luck
Click to expand...
Click to collapse
I'm on 20v, so I should be good.

MTN927 said:
I'm on 20v, so I should be good.
Click to expand...
Click to collapse
yes . thats latest version.. thats good.

OK, I got twrp installed but the two SU's I've flashed don't work. I have SU installed, it needs to update binaires, I try that but it fails every time. Root checkers say I'm not rooted. I think I'm using the wrong SU zip. Any help? Your guide was great btw.
EDIT: OK, now it says i am rooted but I can't get the SU binary to update. It fails every time and then asks me to reboot and try again. Any ideas?
UPDATE: Ok, the SU binary finally updated successfully! I think I'm all good! Gonna check out some custom ROMS later. Any recommendations?

Lineage
https://forum.xda-developers.com/g4/development/rom-cyanogenmod-13-0-lg-g4-t3477475