Database Develop

fastboot: bootloader locked or unlocked?

Hey guys
I noticed that many people are having problems to flash using fastboot. They report that fastboot says the bootloader would be locked, even if it's definitely unlocked.
so my question, who of you is able to flash (kernels for example) using
Code:
adb reboot bootloader
fastboot flash boot boot.img
and who can flash using
Code:
adb reboot oem-unlock
fastboot flash boot boot.img
I've been talking to LG about this problem, but all they said was to change a driver config for ADB. But due to the fact that I'm using Linux, it is impossible that it is a driver problem. I also tried their "solution", but guess what... it didn't work.

first one don't work by me

please use the poll, so that we've got all informations bundled

Hi
I've already voted.
So for me it does not work.Always comes back PERMISSION DENIED.
232.10 3At Austria.
I have rooted and bootloader unlocked.CWM recovery installed.CM 10.1 RC2 installed.
I can flash everything,rom,kernel...
Everything works just Reboot bootloader is not working.
Has an idea? Thanks

I can't really test adb due to idiot computer asking for disk to be inserted. But when I reboot to bootloader it says "now ready" which didn't happen when it was locked. Used the hacked method too, my odm_reserved reads:
0x000000000000000000000000000000000000fdffffffcafffffffdfffefeffed
As @laufersteppenwolf probably knows I am UK 234-000 user, unlocked with the original terminal hacked that blew all our fuses :thumbup:
Sent from my rooted P880

@non4 said:
I can't really test adb due to idiot computer asking for disk to be inserted. But when I reboot to bootloader it says "now ready" which didn't happen when it was locked. Used the hacked method too, my odm_reserved reads:
0x000000000000000000000000000000000000fdffffffcafffffffdfffefeffed
As @laufersteppenwolf probably knows I am UK 234-000 user, unlocked with the original terminal hacked that blew all our fuses :thumbup:
Sent from my rooted P880
Click to expand...
Click to collapse
it's not about the bootloader being locked, it's about the ability to use fastboot for flashing something (kernel for example)

laufersteppenwolf said:
it's not about the bootloader being locked, it's about the ability to use fastboot for flashing something (kernel for example)
Click to expand...
Click to collapse
I know, but does yours say "now ready"? If so then LG really did screw up, idiots
Also if I type "reboot oem-unlock" in terminal I get "welcome to fastboot mode "
Sent from my rooted P880

@non4 said:
I know, but does yours say "now ready"? If so then LG really did screw up, idiots
Also if I type "reboot oem-unlock" I get "welcome to fastboot mode "
Sent from my rooted P880
Click to expand...
Click to collapse
yeah, it says now ready, but fastboot says my bootloader is locked -.-
EDIT: @@non4 already knows LG's answer to this problem, but i think i can tell it y'all:
We are very sorry to say that there is no way to solve the problem you mentioned.
Click to expand...
Click to collapse
nice work LG -.-

laufersteppenwolf said:
yeah, it says now ready, but fastboot says my bootloader is locked -.-
Click to expand...
Click to collapse
You tried typing OEM unlock command? A few people have to do this to get to correct working fastboot mode. In fact I think the guy that got my BL unlocked with his echo odm method had this issue
Sent from my rooted P880

no, i can't ATM...

laufersteppenwolf said:
no, i can't ATM...
Click to expand...
Click to collapse
Reboot oem-unlock works in terminal emulator, that's the only way I can get into "welcome to fastboot" screen. When you can try it, if you can flash stuff through here then we have a solution for you unlucky fellows
Sent from my rooted P880

I'm sorry, but "reboot oem-unlock" does not work.
I just get black screen. :crying:

varadinum said:
I'm sorry, but "reboot oem-unlock" does not work.
I just get black screen. :crying:
Click to expand...
Click to collapse
Weird...
Sent from my rooted P880

Security error for reboot oem-unlock, but manual flash is possible. Normal fastboot says BL is locked, as usual.
Sent from my LG-P880 using Tapatalk 2

maybe you guys can contact LG, too. So they eventually can realize that they've f**ked up, regarding the bootloader...

varadinum said:
Hi
I've already voted.
So for me it does not work.Always comes back PERMISSION DENIED.
232.10 3At Austria.
I have rooted and bootloader unlocked.CWM recovery installed.CM 10.1 RC2 installed.
I can flash everything,rom,kernel...
Everything works just Reboot bootloader is not working.
Has an idea? Thanks
Click to expand...
Click to collapse
maybe my post here helps:
http://forum.xda-developers.com/showthread.php?t=2224020&page=46

adb reboot oem-unlock i got the fastboot welcome screen. i was hoping to see the unlock screen once more because i think something went wrong..

guys, I'm stuck at the CM10.1 boot animation, and after reading numerous posts I found some saying that I need to flash the boot.img through the fastboot. I've managed to go to the Welcome to LG Fastboot Mode though TWRP2.5.0.0 reboot -> bootloader. But when i try fastboot devices my device isn't listed... Any advice on what should I do? Is there any other way to solve the boot issue? I've waited like 15 mins with the phone not getting further than the CM10.1 Logo... :'(
PS: I'm using Minimalistic ADB and Fastboot from here
http://forum.xda-developers.com/showthread.php?p=42407269

both reboot commands "oem-unlock" and "bootloader" are defined in the kernel source code. "oem-unlock" sets an intern hardware flag for booting the unlocked mode and "bootloader" just sets the normal bootloader flag.
wondering why the reboot parameter "recovery" actually only does a normal reboot? (CM has an additional script they call before rebooting to recovery for setting the recovery boot flag)
right, no "recovery" command defined in the kernel source, but its only a few lines of code to add this
------
reboot
bootloader: locked fastboot
oem-unlock: unlocked fastboot
some time ago i messed around with these hardware flags and now oem-unlock doesnt work. it boots instead into recovery lol. no clue why
Gesendet von meinem LG-P880 mit Tapatalk 4 Beta

problem ( Please help quick )
Hi Every One
i have a question
i install new firmware to update hboot
first step to install was relocked bootloader and i did it
after installation i want to unlock my bootloader but my android does not up and freaze on htc one boot animation
how can i unlock my bootloader via fastboot ?? please help me quick

[Q] Bootloader Problem

Hello,
've got a little problem hope you can help me with this.
I have since 2 months my LG 4X HD and I've now decided to root it and unlock the bootloader. Got no problems with the root (did it with the AIO-Tool). When I tried to unlock the bootloader I realized that the AIO tool is only for versions EUR-XXX-& some 262-000. But since I live in Austria, and thus have the version 232-10, it would not work. That's why I first tried the app "Unlock".
While trying this I received error message "Unlock doesn't work anymore" and then the app crashed.
Next, I tried the version 40000000c0 and 40000000c8 with the Terminal.
've tried both variants. Trying 40000000c0 I got an error message, but unfortunately do not know more what it was. Then I looked in the hiddenmenu and saw that the bootloader was unlocked.
Now my problem: Any attempt to boot into the bootloader the phone will hang at the LG logo. I always have to press 10 seconds the power button until it restarts. In the home screen, I get normal, only the bootloader I get the problem mentioned. And I can't also boot into the recovery, even TWRP is installed. Volmue- + Power also dosen't help. It just boot normally into homescreen.
If someone is interested: Before I tried to unlock the bootloader've done a Nandroid backup. All drivers are installed correctly.
Does anyone know how to fix the problem with LG logo?
Information about phone:
Based band version: L6260_MODEM_SIC_02.1233.00
Kernel: 3.1.10
Build Nummber: JZO54K
Version: P88020c-232-10
Hope that was enough information.
Thank you!

Just flash v20a firmware so it would fix recovery and bootloader problems ,then check try to access the bootloader and see if it still gives you an option to unlock it.
Sent from my LG-P880 using xda app-developers app

If you've made a backup.. Surely you have a recovery? you need to do..
Turn on adb and do
adb reboot oem-unlock
You will either get a menu asking whether you want to unlock or it will come up with fastboot... If you get fastboot you have unlocked bootloader I think.. And then you can add the recovery by going to the directory with all your SDK stuff and put the TWRP image there...
Then it's
Fastboot flash recovery [name of recovery].img
Sent from my OptimusX4HD using XDA Premium 4 mobile app

I flashed a new firmware (austria) but it didnt helpt, it still hangs at the lg logo.
Also "adb reboot oem-unlock" didnt work. It just shows me the charging icon and turns off.
Any other ideas?
Thank You.
EDIT: I fixed the problem finally Just flashed the EuroOpen frimware and every thing went fine.
Thanks for the help.

Can't boot into recovery.

Hello,
So I have a P7 at B126. I tried rooting it with kingroot and tried to install TWRP. I got to the part where you have to use fastboot to flash the img and it fails so I gave up. Now I am trying to get into recovery and I can't. It just either goes to a black screen or a Boot failed screen.
Thanks in advance

Hi, I'm a little confused right now. Explain what you did so far a bit more detailed, so we could help you.. Which instruction were you are following? What was the exact error? Is your bootloader unlocked? Can you boot normally?

l3Nni said:
Hi, I'm a little confused right now. Explain what you did so far a bit more detailed, so we could help you.. Which instruction were you are following? What was the exact error? Is your bootloader unlocked? Can you boot normally?
Click to expand...
Click to collapse
I can boot normally.
What I did was this.
I followed the guide to root my phone. Rooted it and then tried to install the TWRP custom recovery. It failed at the installing the recovery for some permission error. So I stopped trying to install it. Now I apparently don't have a recovery at all.
I also installed some root apps like SetCPU, Xposed(Which didn't work), SuperSU(Which didn't Work)
If I try to adb reboot recovery it just takes me to the boot failed screen with the android logo on it. If I try using the Power + Down button it just shows me the huawei ascent P7 screen and just go black.
Also when I go to the fastboot/rescure mode it says my bootloader is unlocked.
Thanks for the reply.

Ah okay. So, boot into the fastboot mode, put the recovery.img in the adb folder on your pc, run cmd and type 'cd c://..' (location of adb folder), then 'fastboot flash recovery [name of recovery.img]' (for example 'fastboot flash recovery recovery_twrp.img'). Now you should get a working recovery.
Are you sure you really got root access? Eventually due to this you got the permission error..

l3Nni said:
Ah okay. So, boot into the fastboot mode, put the recovery.img in the adb folder on your pc, run cmd and type 'cd c://..' (location of adb folder), then 'fastboot flash recovery [name of recovery.img]' (for example 'fastboot flash recovery recovery_twrp.img'). Now you should get a working recovery.
Are you sure you really got root access? Eventually due to this you got the permission error..
Click to expand...
Click to collapse
I do because adb has admin permissions but fastboot doesn't. I tried that with trying to flash twrp on my p7 but i get a failed error after like a second I the command. So I tried flashing a stock recovery and it throws the same error in fastboot.
When I type fastboot devices I get this
? fastboot
No id for my phone but adb sees it.

Ok, your pc does obviously not recognize the p7 in fastboot mode. Did you install the Hi Suite? Through this way you should get the correct drivers (maybe even update/reinstall). If this does not help, I think I can't help you, sorry. You may wait for more help or google what do when the device isn't recognized in fastboot.
Just flash the newest SuperSU.zip when you got a recovery.. That should fix problems with root apps/ the su binary.
Offtopic: I'm not sure if you noticed, but, you're running a pretty old firmware.. You may think about updating

l3Nni said:
Ok, your pc does obviously not recognize the p7 in fastboot mode. Did you install the Hi Suite? Through this way you should get the correct drivers (maybe even update/reinstall). If this does not help, I think I can't help you, sorry. You may wait for more help or google what do when the device isn't recognized in fastboot.
Just flash the newest SuperSU.zip when you got a recovery.. That should fix problems with root apps/ the su binary.
Offtopic: I'm not sure if you noticed, but, you're running a pretty old firmware.. You may think about updating
Click to expand...
Click to collapse
Hi Suite installed and correct drivers are loaded(I hope) and yes thats why Im trying to get this fixed because it wont even let me update firmwares

Try on another pc.. You could also try flashify (look in Google play), but in case of a softbrick you have real problem. Do this on your own risk, most times nothing bad will happen, but it could!
I would recommend to flash the stock recovery, update up to B621 and then installing a custom recovery.

can't boot into recovery
stoutrouge said:
Hello
So I have a P7 at B126. I tried rooting it with kingroot and tried to install TWRP. I got to the part where you have to use fastboot to flash the img and it fails so I gave up. Now I am trying to get into recovery and I can't. It just either goes to a black screen or a Boot failed screen.
Thanks in advance
Click to expand...
Click to collapse
Hi mate.
1. Use your pc, Go shuame.com and download "rom flash program".
2. Enter fastboot&rescue mode and connect your phone and PC
3. The program will recognize your phone.
4. Download anyrom and flash by the program.
The process will not complete but you will have Shuame recovery.
But my case it didn't work properly
5. I downloaded CWM from here "pan.baidu.com/s/1dDq0qcT" password :bttc
Start this program with connect your phone and press nomber 1 and ENTER.
I don't exactly remember my phone was on fastboot & rescue mode or recovery mode.
But I could get recovery and did rom flash so it was fixed.
*****from: Godfrey Peligrino ---sorry i dont know how to post BUT, this guide helped me with my p7 L10 B619..just connect it to pc and let it boot over and over and when pc acknowledge you phone..click rom and just wait if not do it again..hope this will help you too..the writings is on chinese so just copy the english thumbnails before you proceed to download...(QUOTE) THANKS TO THE GUY WHO POST THIS....HE IS TOMODACHI5..

unable to stay in bootloader after kdz to h81120p

So I justI fixed my phone by flashing KDZ h81120p to it. But now I lost my root/TWRP. When I try ADB and sent the command "adb reboot boatloader" the phone just reboots and doesn't stay in the bootloader. So I can't send the command to flash TWRP image.
It does still show "bootloader unlocked" at startup.
Just want to flash TWRP so I can root.
any ideas? thanks

Problematic.
As far as I know, there are just a few ways to get into bootloader:
1/adb reboot bootloader
2/"quick boot" app with root, or advanced power menu from certain ROMs
3/power off, and then key combination boot( NEVER worked for me )

also me, flash h81120p kdz, everything work fine except root lost & boot into recovery but its showing android icon with explanation mark.
please help

Same here.

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?