Database Develop

[Q] Is my phone permanently bricked?

Yesterday, some bad things happened when I went to switch ROMs. Eventually, I ended up erasing my internal storage and re-locking the bootloader. I am aware that mistakes were made and I take full responsibility for my foolish actions.
So right now the problem is that I can't unlock the bootloader with the fastboot command because the "Allow OEM unlocking" box is not checked. The main problem here is that I can't simply boot into the OS and check this. I have no OS because I wiped my internal storage, including all my backups (Yes, I am an idiot.).
The phone is currently stuck on the bootloader screen. Rebooting into recovery just makes the Google splash screen flicker and it goes back to the bootloader immediately. I've seen similar threads but I haven't seen anything that mirrors my issue.
Is the phone bricked until we find a way to bypass the "Allow OEM unlocking" checkbox?
Thanks,
-PurpScurp

PurpScurp said:
Yesterday, some bad things happened when I went to switch ROMs. Eventually, I ended up erasing my internal storage and re-locking the bootloader. I am aware that mistakes were made and I take full responsibility for my foolish actions.
So right now the problem is that I can't unlock the bootloader with the fastboot command because the "Allow OEM unlocking" box is not checked. The main problem here is that I can't simply boot into the OS and check this. I have no OS because I wiped my internal storage, including all my backups (Yes, I am an idiot.).
The phone is currently stuck on the bootloader screen. Rebooting into recovery just makes the Google splash screen flicker and it goes back to the bootloader immediately. I've seen similar threads but I haven't seen anything that mirrors my issue.
Is the phone bricked until we find a way to bypass the "Allow OEM unlocking" checkbox?
Thanks,
-PurpScurp
Click to expand...
Click to collapse
Yes you are bricked.
http://forum.xda-developers.com/nexus-6/help/lock-bricked-nexus-6-t3056401

What recovery is on it?
Have you tried booting a recovery image if you don't have stock recovery?
fastboot boot recovery.img
I'd try to boot twrp may not work with the lock
fastboot erase cache got me out of trouble but I didn't relock my boot loader.
Wish I had a nexus stuck in this situation to fiddle with.

R4INS said:
What recovery is on it?
Have you tried booting a recovery image if you don't have stock recovery?
fastboot boot recovery.img
I'd try to boot twrp may not work with the lock
fastboot erase cache got me out of trouble but I didn't relock my boot loader.
Wish I had a nexus stuck in this situation to fiddle with.
Click to expand...
Click to collapse
I don't believe that command works with a locked bootloader. It had TWRP. Rebooting into recovery doesn't work at all. It just flickers the Google screen then goes back to bootloader menu.
The only thing that the phone does now is show the bootloader screen.
Simply powering on the phone brings it to the bootloader menu. I don't even have to hold power + vol up/down.

Yep it does that if you wipe the OS. There's nothing you can do at the moment.

PurpScurp said:
I don't believe that command works with a locked bootloader. It had TWRP. Rebooting into recovery doesn't work at all. It just flickers the Google screen then goes back to bootloader menu.
The only thing that the phone does now is show the bootloader screen.
Simply powering on the phone brings it to the bootloader menu. I don't even have to hold power + vol up/down.
Click to expand...
Click to collapse
Does a PC recognize it when connected? Can you get fastboot to see the device?

Evolution_Freak said:
Does a PC recognize it when connected? Can you get fastboot to see the device?
Click to expand...
Click to collapse
Yes he can. His bootloaders is locked though so he cannot unlock it.

rootSU said:
Yes he can. His bootloaders is locked though so he cannot unlock it.
Click to expand...
Click to collapse
Oh, ouch. I must have missed that part. So it's basically the same issue so many others have run into.

Evolution_Freak said:
Oh, ouch. I must have missed that part. So it's basically the same issue so many others have run into.
Click to expand...
Click to collapse
Unfortunately so.

HELP PLEASE! Stuck in bootloader, NEXUS 6

Hi, I wanted to flash the 5.1 update to my new Nexus 6.
I went all over the basic steps.
After I unlocked the bootloader I tried to flash the image with the flash-all command.
It failed, so I remembered maybe I forgot to click on USB debugging? (This confuses me because I think I shouldn't be able to unlock bootloader without this).
When I wanted to start android I locked it first, so I would unlock it afterwards and erase everything to start as new.
Whan I locked it, I could not unlock it again. I can't access Android, neither do anything else like factory reset nor Recovery Mode. I return to the bootloader as soon as I press anything.
There are red words at the top: AP Fastboot Flash Mode (Secure). Does this means anything?
Is there any way to force unlocking the bootloader? When I try it, the phone tells me to go to Developer Options but I can't access Android.
Please HELP! Is there any way to flash a rom or android again in locked state? Recovery?
Thanks for reading this and thinking about a solution! I really hope I won't be stuck forever in bootloader.

Uh oh... Were you trying to downgrade back to LRX22C from LMY47D so that you could upgrade to LMY47M, by any chance?
If so you might be fooked.

Actually no. I was trying to upgrade from 5.01 to 5.1. I'm really scared of having my Nexus 6 bricked. I can't do anything to unlock the bootloader. Maybe I could sideload a recovery? But do I need to be unlocked?
Sent from my Nexus 7 using XDA Free mobile app

Try here this might help you. I hope.
http://forum.xda-developers.com/showthread.php?t=3059518

I hope you get it sorted out. I have read SO many bad things regarding this topic and people being screwed that they cant get back in to re-unlock after relocking

toknitup420 said:
Try here this might help you. I hope.
http://forum.xda-developers.com/showthread.php?t=3059518
Click to expand...
Click to collapse
I already tried this solution, I think mine is a little different. At the end of the post it says to enter fastboot and restore with a factory image. I can't because I am not unlocked. In order to unlock my device I have to go to Developer Settings (it is the message when I use the OEM unlock command). but I can't access to Android. I am stuck in the bootloader but can run fastboot commands.

sotnasnauj said:
I already tried this solution, I think mine is a little different. At the end of the post it says to enter fastboot and restore with a factory image. I can't because I am not unlocked. In order to unlock my device I have to go to Developer Settings (it is the message when I use the OEM unlock command). but I can't access to Android. I am stuck in the bootloader but can run fastboot commands.
Click to expand...
Click to collapse
The solution that was posted should work, but you need to use RSD Lite in order to flash the factory image, not fastboot.
Read it over nice and slow again, because you are in panic mode right now, so take your time and you will get it back up and running with no problems.

idtheftvictim said:
The solution that was posted should work, but you need to use RSD Lite in order to flash the factory image, not fastboot.
Read it over nice and slow again, because you are in panic mode right now, so take your time and you will get it back up and running with no problems.
Click to expand...
Click to collapse
I think you are 100% right. I am in panic mode, thanks. I'll do it again following every step. I'll let you know.

sotnasnauj said:
I already tried this solution, I think mine is a little different. At the end of the post it says to enter fastboot and restore with a factory image. I can't because I am not unlocked. In order to unlock my device I have to go to Developer Settings (it is the message when I use the OEM unlock command). but I can't access to Android. I am stuck in the bootloader but can run fastboot commands.
Click to expand...
Click to collapse
You should be OK. People in that thread have reported success flashing the new factory image while locked. Check the last few pages of the thread.

toknitup420 said:
You should be OK. People in that thread have reported success flashing the new factory image while locked. Check the last few pages of the thread.
Click to expand...
Click to collapse
Thanks! I've been reading a lot from this thread but I get something unusual as the other people are experiencing. When I try to flash partition gpt.bin I get (bootloader) Unlock before flashin.
It is kind of contradictory as this fix supposedly fixes flashing without unlocking. I don't know if it is a problem of drivers. My PC sees my N6 as Google Nexus Bootlader Interface. In the thread, the PC sees the device as "Bulk" or "Qualcomm ....... etc etc".
My panic mode isn't turning off. I may be missing something.

sotnasnauj said:
Thanks! I've been reading a lot from this thread but I get something unusual as the other people are experiencing. When I try to flash partition gpt.bin I get (bootloader) Unlock before flashin.
It is kind of contradictory as this fix supposedly fixes flashing without unlocking. I don't know if it is a problem of drivers. My PC sees my N6 as Google Nexus Bootlader Interface. In the thread, the PC sees the device as "Bulk" or "Qualcomm ....... etc etc".
My panic mode isn't turning off. I may be missing something.
Click to expand...
Click to collapse
Did utry fastboot devices to see your device is connected...then fastboot oem unlock?
Also, I'm the one who has found a fix for the bricked issues when it comes to locking and unlocking the boot loader...in boot loader...when u go to recovery....what happens?

Yes, my device is connected. I've tried everything. I've been reading the last thread and posted what is happening to me, this is the URL of my posts.
http://forum.xda-developers.com/showthread.php?p=59659030
I can't go to recovery, I return to the BL.

idtheftvictim said:
The solution that was posted should work, but you need to use RSD Lite in order to flash the factory image, not fastboot.
Read it over nice and slow again, because you are in panic mode right now, so take your time and you will get it back up and running with no problems.
Click to expand...
Click to collapse
Now I've tried everything in that thread, when I was reading I thought flashing gpt.bin would be the solution but I can't do it, I can't flash it.. It says "Unlock before flashing". Supposedly flashing gpt.bin would allow me to flash without unlocking.
My last resource is trying this on a mac, I've read you don't need drivers so maybe it is a driver thing. I HOPE SO..
Can't access adb with my pc.

You don't need adb.

sotnasnauj said:
Yes, my device is connected. I've tried everything. I've been reading the last thread and posted what is happening to me, this is the URL of my posts.
http://forum.xda-developers.com/showthread.php?p=59659030
I can't go to recovery, I return to the BL.
Click to expand...
Click to collapse
Download factory images...extract them....pull the stick recovery and use the command fastboot flash recovery recovery.IMG
Also...did ubuse fastboot OEM unlock?

jamescable said:
Download factory images...extract them....pull the stick recovery and use the command fastboot flash recovery recovery.IMG
Also...did ubuse fastboot OEM unlock?
Click to expand...
Click to collapse
Yes, I used it but it tells me I need to go to Developer Settings and Allow OEM Unlock which I cant because cant access Android.
I can't flash anything as I am OEM Locked

sotnasnauj said:
Yes, I used it but it tells me I need to go to Developer Settings and Allow OEM Unlock which I cant because cant access Android.
I can't flash anything as I am OEM Locked
Click to expand...
Click to collapse
I think you should lock this thread. Following advice from different people in different threads is a really BAD idea.

rootSU said:
I think you should lock this thread. Following advice from different people in different threads is a really BAD idea.
Click to expand...
Click to collapse
I agree because op is somehow confused.....fastboot has nothing to do with develope settings USB enabled

Yes it does. He flashed the factory images, then relocked (which defaults to disabled oem unlocking). But something failed (guessing possibly userdata failed). I would recommend fastboot formats userdata to perform a factory reset from the boot loader to see if you can get android to boot.
Sent from my Nexus 6

hlxanthus said:
Yes it does. He flashed the factory images, then relocked (which defaults to disabled oem unlocking). But something failed (guessing possibly userdata failed). I would recommend fastboot formats userdata to perform a factory reset from the boot loader to see if you can get android to boot.
Sent from my Nexus 6
Click to expand...
Click to collapse
Yes.
Running
Code:
fastboot format cache
fastboot format userdata
Make sure it's FORMAT not erase.
Then walk away, watch some T.V. and don't check it for a while. (Panic mode will make it seem forever, trust me! I did the same thing as you!)

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.

How To Guide PSA: Fix for "Device Corrupted" when trying to relock bootloader.

plempereur said:
A few notes on my experience with this tablet : I got it with the global rom and I wished to flash the stock rom and re-lock the tablet after to restore it in the original factory state :
- Flashed the CN rom using this guide, it went fine. I used "adb oem edl" to enter EDL mode as the mehod with the buttons did not work for me
- Re locked using "fastboot flashing lock" from the bootloader menu (vol+up), not the fastboot menu. (this driver was needed to "see" the tablet with fastboot)
- The tablet was bricked (refused to boot after re-locking / some error messsage like "system corrupted / unable to boot" then after this it just kept going to the bootloader when turning on)
- Unlocked the bootloader using "fastboot oem unlock-go"
- Managed to flash again from EDL, to enter EDL again (took me a bit of time to figure this) I had to use "fastboot oem reboot-edl" from the bootloader
- Starting over I did all the OTA updates up to ZUI14 "14.0.255 ST" (I received the updates even if the tablet bootloader is unlocked), then did a "Factory data reset" from the settings menu.
- After this I attempted to lock again and... it worked. Not 100% sure if it's due to the Z14 OTA, the factory reset or both (I suspect the OTA).
(I am keeping the "OEM unlocking" (allows the unlocking of the bootloader) option enabled in the developper options just in case I need to re-flash for some reason in the future)
Hope this can help others,
Cheers
Click to expand...
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Reposting this guide from @plempereur as it deserves prominent attention.

OMGrant said:
Reposting this guide from @plempereur as it deserves prominent attention.
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I used this guide mentioned in that post, but this post helped me solve some issues I had. We need a sticky with links to all the posts in that one long thread because there's so much information in there and its buried.