Tmobile Oneplus 7t - Relocked Bootloader Stucks in Your device is corrupt. It can't be trusted and will not boot

[bahadorkh]

Hi,

I have recently bought a T-mobile version of OP7T. Even though T-Mobile unlocked the network permanently, I still didn't like T-mobile branding at the start, plus I wanted Stock OxygenOs. So what did I do?
(No root and No TWRP)

1. I've Unlocked the bootloader via the method in this post. Stage-1
2. I have flashed the stock rom which I downloaded from this post. Stage-2
3. Phone loads up perfectly fine and now I have stock OOS. to make sure everything is fine, I also did a factory reset and re-flashed the stock rom to make sure there's no track of previous roms.
4. I then wanted to relock the bootloader in order to keep my device safe and enjoy having a normal device like any others without the ugly message at the startup.
5. So I put it in fastboot mode and executed "fastboot flashing lock" or "fastboot oem lock" and it gave me the options and I locked the bootloader.
6. after this, I can't do anything else. it keeps showing me the page where it says Your device is corrupt. It can't be trusted and will not boot and in order to get rid of I need to keep unlocking the devices relfashing everything and the rest of the story.

I've read all the accurate and inaccurate infos on forums where another guy claims when he did turn everything to stock (recovery + rom + factory reset) things go back to normal and he's done. in my case it doesn't work.

Please help me, how I can be able to relock the bootloader without running into Your device is corrupt. It can't be trusted and will not boot.
Thanks.

 

[lil_kujo]

First I think no help is stupid, since that is the regular way of doing it. Second you should have read extensively before doing what you did. T-mobile is very specific device. What he probably didn't mention is that you need the original rom t-mobile branded, since you need original software to be able to relock bootloader. I would recommend use msm- tool to recover you device. Read carefully and next time just be sure that what you are doing is informed.

 

[bahadorkh]

I have unlocked the device and installed everything. the phone works like a charm.
My only problem is that I can't re-lock the bootloader.

 

[lil_kujo]

I have unlocked the device and installed everything. the phone works like a charm.
My only problem is that I can't re-lock the bootloader.

That was my point in order to relock your device you must have the original firmware that the phone came with if it's t-mobile. Installed in both slots. Then you can relock you device.

 

[谷歌原生]

Please try this thread

[OP7T T-MOBILE][OOS 10.0.10 HD63CB] Unbrick tool to restore your device to OxygenOS

Disclaimer: By attempting any of the processes listed in this thread you accept full responsibility for your actions. I will not be held responsible if your device stops working, catches fire, or turns into a hipster and claims to have been...

forum.xda-developers.com