Database Users

Is it possible to relock the bootloader?

I'm holding off twrp + bootloader unlock because I want to be able to undo in case I need to use my warranty. Is twrp/bootloader unlock reversible? Many thanks

Yes. Flash complete stock everything, boot into bootloader, connect to PC, and "fastboot oem lock".

Is it sure that it works??I have a A2017G and i have open BL and a B29 Custom Rom and i want back to Lock Bootloader

Kevinkuensken said:
Is it sure that it works??I have a A2017G and i have open BL and a B29 Custom Rom and i want back to Lock Bootloader
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Click to collapse
Yup! I've done it plenty of times. You do need to format the data partition though. This could mean that it'll wipe out even your internal storage, so back that up as well!

Im on stock and then i go to edl and then i type fastboot oem lock but nothing happend

Kevinkuensken said:
Im on stock and then i go to edl and then i type fastboot oem lock but nothing happend
Click to expand...
Click to collapse
Boot into bootloader, not EDL.

Erahgon said:
Yup! I've done it plenty of times. You do need to format the data partition though. This could mean that it'll wipe out even your internal storage, so back that up as well!
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Click to collapse
and you can unlock it again afterwards?
Never heard of anyone wanting to lock the bootloader so I'd a newb in this kind of thing.

BlazingBullets said:
and you can unlock it again afterwards?
Never heard of anyone wanting to lock the bootloader so I'd a newb in this kind of thing.
Click to expand...
Click to collapse
Locking it again is good for when you want to sell the device or send it in for warranty repair.

BlazingBullets said:
and you can unlock it again afterwards?
Never heard of anyone wanting to lock the bootloader so I'd a newb in this kind of thing.
Click to expand...
Click to collapse
Yeah, the unlock procedure is the same as before. If you didn't restore the original boot image before the relock, then it's just a matter of booting into fastboot and unlocking the device. Note that this will cause your data to be wiped as well!

If you restore your boot.bin backup file from when your device was locked, does this lock the bootloader? "fastboot oem lock", "fastboot flashing lock" nor "fastboot oem device-info" does nothing for me. Is there any other way to check if your bootloader has been relocked?
Thanks

H0lmEd said:
I'm holding off twrp + bootloader unlock because I want to be able to undo in case I need to use my warranty. Is twrp/bootloader unlock reversible? Many thanks
Click to expand...
Click to collapse
Hi there,
Were you ever able to re-lock your bootloader on your A2017G?
I just want root for now but understand that I'll need to unlock the bootloader first. Before doing that, I want to make sure I can re-lock the bootloader if needed.
Thanks for letting us know!

joaste said:
Hi there,
Were you ever able to re-lock your bootloader on your A2017G?
I just want root for now but understand that I'll need to unlock the bootloader first. Before doing that, I want to make sure I can re-lock the bootloader if needed.
Thanks for letting us know!
Click to expand...
Click to collapse
Guys/Gals, it is seriously as simple as using the fastboot command in reverse. I've done it a few times already with mine.
If you used the following to unlock....
fastboot devices
fastboot oem unlock
.....then you can use the following commands to relock
fastboot devices
fastboot oem lock
fastboot devices is not necessary, but I do it to make sure the devices is being recognized by ADB/FASTBOOT

sauerkraut17 said:
Guys/Gals, it is seriously as simple as using the fastboot command in reverse. I've done it a few times already with mine.
If you used the following to unlock....
fastboot devices
fastboot oem unlock
.....then you can use the following commands to relock
fastboot devices
fastboot oem lock
fastboot devices is not necessary, but I do it to make sure the devices is being recognized by ADB/FASTBOOT
Click to expand...
Click to collapse
Thanks for the answer.
But there are a few files to flash before using that command according to this thread.
Doesn't anything need to be flashed again (e. g. stock files or anything)?

Correct, but you would have already flashed those in order to use the unlock command in the first place.
Are you trying to relock on marshmallow or nougat?

sauerkraut17 said:
Correct, but you would have already flashed those in order to use the unlock command in the first place.
Are you trying to relock on marshmallow or nougat?
Click to expand...
Click to collapse
My phone is only a few days old. I'm debating whether to keep it or not (considering the Mate 9, but the price is not the same - love the form factor and bigger screen though - sound won't be the same and I think I'll miss the MiPop button on the Axon (never thought that would happen )).
I'm on the latest MM (B10 - the A2017G model).
Following the mentioned thread, I got to the point of installing TWRP (the signed version), only to realize that besides making backups, there is not much else I can do with that without unlocking the bootloader. I really just wanted to flash supersu and install adaway fro the time being until development matured for this phone (maybe also play around with viper - had great results on my LG G4).

HI, I get the error "FAILED (remote: unknown command)" in ADB when I enter "fastboot oem lock". Any way to fix this?

Guys, can anyone help me? I really need to lock the bootloader!
How can I fix the error "FAILED (remote: unknown command)" in ADB when I enter "fastboot oem lock"?
I'm on MM B11 Stock.
https://i.imgur.com/fdkgYs6.jpg

Hi Guys,
The Axon 7 Model A2017U I just purchased has the bootloader locked and it is running LineageOS 14.1 - 2018032-Nightly-axon7. I need to relock the bootloader and get back to the stock MiFavor rom so that I can send the phone to ZTE for repair. Can you please explain to a newb in some detail how to achieve that.
Thank you.

Help unable to relock the bootloader

I am trying to relock the bootloader in adb terminal by using command fastboot oem lock I get a message during boot stating that the system has been destroyed and boot loop.
How to relock bootloader with out flashing stock rom
Thanks in advance ?

Vishal21896 said:
I am trying to relock the bootloader in adb terminal by using command fastboot oem lock I get a message during boot stating that the system has been destroyed and boot loop.
How to relock bootloader with out flashing stock rom
Thanks in advance
Click to expand...
Click to collapse
use reflash tutorial from this site:
HTML:
https://xiaomifirmware.com/roms/download-official-roms-xiaomi-mi-a1/
. Just download tool, extract, then exctract downloaded rom in this tool folder. Conect A1 in fastboot and start flash_all_lock.bat file in folder with room (I used flash_all.bat). This is how I fixed my bootlops...

You need to reflash. There's no other way.

Did you have the original stock Oreo with January security patch?
I would also like to re-lock the bootloader but now I have read your post I am unsure if its safe.

Use this command in adb
fastboot oem relock (your unlock code if needed)

Youssef Reda said:
Use this command in adb
fastboot oem relock (your unlock code if needed)
Click to expand...
Click to collapse
If I enter fastboot oem relock with MagiskManager or Magisk 15.3 installed, will I brick the phone?

amzazine said:
If I enter fastboot oem relock with MagiskManager or Magisk 15.3 installed, will I brick the phone?
Click to expand...
Click to collapse
Maybe
I didn't try it but it may brick your phone

Developers should make clear that Re-locking the bootloader is not as easy as the unlock process and there is a high risk you will brick your phone.

i just have this issue ,which is i unlock then i lock the oem and then the message ' system has been destroyed ' and when i try to unlock back the message 'error: oem unlock is not allowed' so i really need your help ..how can i fix my phone ...plsss send a respond quickly

[Guide] Relock Oreo bootloader, go back to stock ROM and get OTA

This method is only works, if you are in Oreo
unlocked bootloader, and use custom rom,
DISCLAIMER
Not taking responsibility if it goes wrong
We have found a way to get back to stock, and relock the bootloader! for now, it only works for the XT-1635-02 because we dont have a signed stock image for any other phone model.
you can use this on any software channel!
How it works.
YOU NEED TO BE ON A CUSTOM ROM TO RELOCK THE BOOTLOADER!
1 - Download Stock ROM in the first post down below
2 - install adb minimal fastboot
3 - after install adb minimal fastboot, go to the install location and paste all the files there
5 - Copy all commands how is in this site and past it on the cmd screen and wait. (you need to press enter for the last command)
Stock Oreo Signed ROM
If u are in June bootloader Kindly use June Security Patch rom, otherwise, phone should be Brick
June Security Patch
Commands
fastboot getvar max-sparse-size
fastboot oem fb_mode_set
fastboot flash partition gpt.bin
fastboot flash bootloader bootloader.img
fastboot flash modem NON-HLOS.bin
fastboot flash fsg fsg.mbn
fastboot erase modemst1
fastboot erase modemst2
fastboot flash dsp adspso.bin
fastboot flash logo logo.bin
fastboot flash boot boot.img
fastboot flash recovery recovery.img
fastboot flash system system.img_sparsechunk.0
fastboot flash system system.img_sparsechunk.1
fastboot flash system system.img_sparsechunk.2
fastboot flash system system.img_sparsechunk.3
fastboot flash system system.img_sparsechunk.4
fastboot flash system system.img_sparsechunk.5
fastboot flash system system.img_sparsechunk.6
fastboot flash system system.img_sparsechunk.7
fastboot flash system system.img_sparsechunk.8
fastboot flash system system.img_sparsechunk.9
fastboot flash system system.img_sparsechunk.10
fastboot flash system system.img_sparsechunk.11
fastboot flash oem oem.img
fastboot erase carrier
fastboot erase cache
fastboot erase userdata
fastboot erase DDR
fastboot oem fb_mode_clear
fastboot oem lock
fastboot oem lock
fastboot flash oem oem.img
fastboot flash system system.img_sparsechunk.0
fastboot flash system system.img_sparsechunk.1
fastboot flash system system.img_sparsechunk.2
fastboot flash system system.img_sparsechunk.3
fastboot flash system system.img_sparsechunk.4
fastboot flash system system.img_sparsechunk.5
fastboot flash system system.img_sparsechunk.6
fastboot flash system system.img_sparsechunk.7
fastboot flash system system.img_sparsechunk.8
fastboot flash system system.img_sparsechunk.9
fastboot flash system system.img_sparsechunk.10
fastboot flash system system.img_sparsechunk.11
fastboot flash boot boot.img
fastboot oem lock
Now youre phone will reboot, and your phone is locked again.

I'm using this ROM here:
[ROM][Stock+] [7.1.1] Dec. Patch NPNS26.118-22-2-12 Prerooted
https://forum.xda-developers.com/moto-z-play/development/rom-nov-patch-npns26-118-22-2-8-t3717037
Do I need to perform any procedures before starting this installation?

I think fast boot erase modemmst 1 & 2 may get a result of IMEI 0 error.

talktosam said:
DISCLAIMER
Not taking responsibility if it goes wrong
We have found a way to get back to stock, and relock the bootloader! for now, it only works for the XT-1635-02 because we dont have a signed stock image for any other phone model.
you can use this on any software channel!
Click to expand...
Click to collapse
talktosam said:
So how does this differ from the method below that was posted here months ago by someone else on doing the same thing? Looks like you copied and pasted....
https://forum.xda-developers.com/moto-z-play/how-to/guide-relock-bootloader-to-lasted-stock-t3718190
Click to expand...
Click to collapse

Jimi Mack said:
talktosam said:
DISCLAIMER
Not taking responsibility if it goes wrong
We have found a way to get back to stock, and relock the bootloader! for now, it only works for the XT-1635-02 because we dont have a signed stock image for any other phone model.
you can use this on any software channel!
Click to expand...
Click to collapse
talktosam said:
So how does this differ from the method below that was posted here months ago by someone else on doing the same thing? Looks like you copied and pasted....
Yes, text is copied, but rom is different Oreo... procedure is same...
https://forum.xda-developers.com/moto-z-play/how-to/guide-relock-bootloader-to-lasted-stock-t3718190
Click to expand...
Click to collapse
Click to expand...
Click to collapse

talktosam said:
Thanks for clearing that up. So the older was to fully restore to Nougat and yours it to restore to Oreo. So being I never updated to Oreo I should restore with the old file, as I am sure yours would cause issues being I never updated to Oreo. You should clearly document that in the thread as well and not just the Title as well if this is the case. Just because most people do not thoroughly read but skim quickly and then jump without looking.
Click to expand...
Click to collapse

Jimi Mack said:
talktosam said:
Thanks for clearing that up. So the older was to fully restore to Nougat and yours it to restore to Oreo. So being I never updated to Oreo I should restore with the old file, as I am sure yours would cause issues being I never updated to Oreo. You should clearly document that in the thread as well and not just the Title as well if this is the case. Just because most people do not thoroughly read but skim quickly and then jump without looking.
Click to expand...
Click to collapse
Yes, if you are in 0xC182 Oreo bootloader, in title i mentioned its works only if u are in oreo bootloader unlocked
Click to expand...
Click to collapse

Can I use this tutorial if I have 0xC114 bootloader (february patch)???

gercdgcat said:
Can I use this tutorial if I have 0xC114 bootloader (february patch)???
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Click to collapse
Yes, but u are in custom rom, u can,

I was in AOSP 8.1 with Oreo bootloader (I had stock oreo before installing the ROM) and just did this procedure, everything went fine ! IMEI is safe and system works as intended, thank you !

If I have the bootloader blocked and I want to update to OREO with your tutorial which commands would I have to skip?

Dude you are a lifesaver..
---------- Post added at 12:32 PM ---------- Previous post was at 12:30 PM ----------
Mario3DS said:
I was in AOSP 8.1 with Oreo bootloader (I had stock oreo before installing the ROM) and just did this procedure, everything went fine ! IMEI is safe and system works as intended, thank you !
Click to expand...
Click to collapse
I am in the exact same situation as you. I will give this a try and report

djdelarosa25 said:
Dude you are a lifesaver..
---------- Post added at 12:32 PM ---------- Previous post was at 12:30 PM ----------
I am in the exact same situation as you. I will give this a try and report
Click to expand...
Click to collapse
Just do exactly what OP says and everything will be fine, I even recovered my Software Channel (attmx) somehow
oh and btw, you can "fix" the navbar bug in stock Oreo changing the theme with Custom Navigation Bar (it's an app)
I just did it and it fixed it completely

Mario3DS said:
Just do exactly what OP says and everything will be fine, I even recovered my Software Channel (attmx) somehow
oh and btw, you can "fix" the navbar bug in stock Oreo changing the theme with Custom Navigation Bar (it's an app)
I just did it and it fixed it completely
Click to expand...
Click to collapse
Your software channel isn't supposed to change anyway

Safety net failed, help
CTS profile match only failed. Is it because of unlocked bootloader?

The bootloader unlocked screen doesn't seem to want to go away
EDIT: My bootloader is still unlocked.
EDIT: Fixed. It wasn't mentioned that you need to enable OEM unlocking in Developer options, noobs like me might get confused. Lucky I got that sorted out

djdelarosa25 said:
The bootloader unlocked screen doesn't seem to want to go away
EDIT: My bootloader is still unlocked.
EDIT: Fixed. It wasn't mentioned that you need to enable OEM unlocking in Developer options, noobs like me might get confused. Lucky I got that sorted out
Click to expand...
Click to collapse
So... Now are you in Oreo stock with locked bootloader? In boot image only shows motorola logo? Nothing of bad key or any notification?

gercdgcat said:
So... Now are you in Oreo stock with locked bootloader? In boot image only shows motorola logo? Nothing of bad key or any notification?
Click to expand...
Click to collapse
Yup, 100% stock. No more bootloader warning message. The guide did not mention that within the custom ROM that you are using, you must have OEM Unlocking under Developer options turned on before you flash the commands.

djdelarosa25 said:
Yup, 100% stock. No more bootloader warning message. The guide did not mention that within the custom ROM that you are using, you must have OEM Unlocking under Developer options turned on before you flash the commands.
Click to expand...
Click to collapse
I think OEM Unlocking only exists in the stock ROM. Regardless of whether you're on a stock ROM already or are flashing the stock ROM, as you mentioned, OEM unlocking must be turned on for the OEM locking commands to work.
Of course, with re-locking your bootloader, it's up to you if you wish to keep OEM Unlocking enabled or disabled afterwards. If you disable it, your device will not be unlockable until you boot into system, which can be more secure but if you have any boot issues, then troubleshooting is a lot more difficult, plus you have no warranty. If you leave OEM unlocking on, then you could unlock your bootloader, but then so can anyone else with physical access to your device.

echo92 said:
I think OEM Unlocking only exists in the stock ROM. Regardless of whether you're on a stock ROM already or are flashing the stock ROM, as you mentioned, OEM unlocking must be turned on for the OEM locking commands to work.
Of course, with re-locking your bootloader, it's up to you if you wish to keep OEM Unlocking enabled or disabled afterwards. If you disable it, your device will not be unlockable until you boot into system, which can be more secure but if you have any boot issues, then troubleshooting is a lot more difficult, plus you have no warranty. If you leave OEM unlocking on, then you could unlock your bootloader, but then so can anyone else with physical access to your device.
Click to expand...
Click to collapse
OEM unlocking also exists in custom ROMs. The reason that relocking your bootloader is not possible with the stock ROM is that the option is greyed out if you have your bootloader unlocked, thus making the bootloader lock commands not work. With a custom ROM, I was able to toggle OEM unlocking on, even when my bootloader was already unlocked. This allowed the bootloader lock commands to work and make the warning message disappear.

Cannot boot Mi A1 after locking bootloader

Hi could I ask because i lock my bootloader on Mi A1 but unfortunately the device didn't boot up.
Now, I am trying to unlock bootloader to fix my device and it won't unlock FAILED (remote: oem unlock is not allowed).
I am on May latest security patch build. Please help me.

Did you try reflashing ROM with Mi Flash tool? Use "Save user data" option there.

hulicow said:
Hi could I ask because i lock my bootloader on Mi A1 but unfortunately the device didn't boot up.
Now, I am trying to unlock bootloader to fix my device and it won't unlock FAILED (remote: oem unlock is not allowed).
I am on May latest security patch build. Please help me.
Click to expand...
Click to collapse
I think you tried to lock your phone after rooting your device. You'll have to try to switch to fastboot mode by volume down + power after vibration. Then use flash using Mi flash tool

I cannot do that, the bootloader is locked and I am on May security patched. Those fastbook oem unlock and fastboot flashing unlock methods won't work. I believe only testpoint is the solution to my problem.

Stuck with the exact same problem....did u find the solution

hulicow said:
I cannot do that, the bootloader is locked and I am on May security patched. Those fastbook oem unlock and fastboot flashing unlock methods won't work. I believe only testpoint is the solution to my problem.
Click to expand...
Click to collapse
Reboot to fastboot power+volume down then reboot to edl mode by typing "fastboot oem edl" in your adb your phone will turn black. Open miflash and click "refresh" if you see "com#X" it means its connected then flash the fasboot file you downloaded in mi forums after finish press and hold power until it restarts.

Lock bootloader in Stock oreo

I am using A2017U, and for some reasons i unlocked my bootloader and flashed custom rom. Now i want to lock my bootloader but i tried several times to enter fastboot but the device is not entering fastboot through any mean, i tried through physical kepess through adb command, everything.
please help me.

teji007 said:
I am using A2017U, and for some reasons i unlocked my bootloader and flashed custom rom. Now i want to lock my bootloader but i tried several times to enter fastboot but the device is not entering fastboot through any mean, i tried through physical kepess through adb command, everything.
please help me.
Click to expand...
Click to collapse
Maybe by using Axon 7 EDL toolkit to enable fastboot first (Unlock option), then "fastboot oem lock" in fastboot mode. Refer to https://forum.xda-developers.com/showpost.php?p=78267172&postcount=200 . Warning : you need stock ROM (no changes in boot, recovery, system/root etc...) to avoid bricking your phone.