accidentally locked bootloader - Redmi K20 / Xiaomi Mi 9T Questions & Answers

Just resently restored my phone through miflash, because i didnt format data when flashing a rom. Phone works fine now. I accidentally locked the bootloader because i didnt uncheck the relock box. But want to reunlock bootloader, can i do that with the mi unlock tool without problems?

In MI Unlock it is stated and given tutorial if you need to get to Fastboot mode you can unlock it from there but you will lose Find My Device feature. If you don't need to access the Fastboot at the moment you may leave the phone locked and so secured. The choice is up to you.

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Root without unlocking bootloader

Like on the Nexus One, I would like to know if there is a way to root the phone without unlocking the bootloader. I have apps on my phone that I cant currently have wiped, so therefore cant unlock the bootloader. However if i can root, I can backup that specific app, and then unlock the bootloader, install roms etc, and then restore my app. Any help would be great, thanks.
nintendolinky said:
Like on the Nexus One, I would like to know if there is a way to root the phone without unlocking the bootloader. I have apps on my phone that I cant currently have wiped, so therefore cant unlock the bootloader. However if i can root, I can backup that specific app, and then unlock the bootloader, install roms etc, and then restore my app. Any help would be great, thanks.
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Click to collapse
As of now there is no way to root without unlocking the bootloader
unlock bootloader : fastboot oem unlock
lock bootloader : fastboot oem lock
Amon_RA said:
unlock bootloader : fastboot oem unlock
lock bootloader : fastboot oem lock
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He cant do a full wipe though is what he is saying
Bite the bullet and redo all your apps.
I cant bite the bullet, as the app has data that has to be remotely pushed to my phone and the people who do that are away for Christmas, Is there no way at all to root without unlocking the bootloader.

Unlocking/Locking/Relocking Bootloader

Hi XDA!
I recently unlocked my phone's bootloader to install an update for my p8lite and I want to lock it back. There is an option called relocking the bootloader and I want to know whether it is the same as locking the bootloader. Also will the ability to flash ROMs through fastboot lose after i relock it?
Thanks
Yes, it is the same, and yes, you will lose the fastboot flash ability. However, the fastboot screen won't show "Locked", it will show "Relocked"

unlock after relock

several questions in no particular order:
Does the "OEM Unlocking" toggle do anything on the XT1572?
If I issue the fastboot OEM LOCK command after having sucessfully unlocked the device before, do I need to go through the full data wipe+send oem data+flash unlock code process again?
Lastly, I was able to flash the MM firmware for my Single SIM AISA model XT1572 despite having the bootloader locked (I think).
Is that normal that I can flash the official moto firmware using just fastboot without having to tweak with anything else?
I presume that since the digital signatures are correct the bootloader has no issue accepting the MM files.
Not quite the end of the world if I have to wipe everything and start over (it's only been a day) but I regret not knowing earlier. Nor did I expect to get this far with a relocked boot loader. Was trying to add SuperSU and found that while I can overwrite flash the stock recovery I cannot flash TWRP.
psyvenrix said:
several questions in no particular order:
Does the "OEM Unlocking" toggle do anything on the XT1572?
If I issue the fastboot OEM LOCK command after having sucessfully unlocked the device before, do I need to go through the full data wipe+send oem data+flash unlock code process again?
Lastly, I was able to flash the MM firmware for my Single SIM AISA model XT1572 despite having the bootloader locked (I think).
Is that normal that I can flash the official moto firmware using just fastboot without having to tweak with anything else?
I presume that since the digital signatures are correct the bootloader has no issue accepting the MM files.
Not quite the end of the world if I have to wipe everything and start over (it's only been a day) but I regret not knowing earlier. Nor did I expect to get this far with a relocked boot loader. Was trying to add SuperSU and found that while I can overwrite flash the stock recovery I cannot flash TWRP.
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Click to collapse
As far as I am concerned relocking the bootloader wont wipe your data and yes about the question regarding the stock firmware
PS: Dont relock your bootloader once you unlock it the warranty doesnt come back even if you lock it again

[Q] Cannot Get to Fastboot after Unlocking Bootloader

So I unlocked my bootloader a while ago, and I have the screen telling me to lock the bootloader. I would lock the bootloader, but when I try to get to the bootloader to do fastboot and oem lock, it just goes back to the screen that tells me to lock the bootloader. Everything works fine, but with an unlocked bootloader, I can't use Netflix as my device is uncertified now. Is there a twrp zip that will help me get my bootloader back to normal? I tried using edl and twrp to try and get it back, but have yet to find a file that works.
Lots of threads on this already.
Thread Closed, Duplicate

Hard Bricked after failed OTA

Hi. My friend mistakenly turned off her phone while it was performing an OTA.
Now it won't boot up and recovery doesn't even work. Fastboot does however work but not much else.
The device is completely stock with no USB Debugging and a locked bootloader. Additionally, the bootloader can't even be unlocked (fastboot oem unlock), as it wasn't enabled for unlock in developer settings.
This means I'm not able to do almost anything with fastboot.
What are our options here to restore the recovery and OS?
haverdaden said:
Hi. My friend mistakenly turned off her phone while it was performing an OTA.
Now it won't boot up and recovery doesn't even work. Fastboot does however work but not much else.
The device is completely stock with no USB Debugging and a locked bootloader. Additionally, the bootloader can't even be unlocked (fastboot oem unlock), as it wasn't enabled for unlock in developer settings.
This means I'm not able to do almost anything with fastboot.
What are our options here to restore the recovery and OS?
Click to expand...
Click to collapse
I suggest you guys try out the Unbrick Tool from this thread: https://forum.xda-developers.com/oneplus-5/how-to/op5-collection-unbrick-tools-t3898870

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