Bootloader unlocking problem

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abckbc

New member
May 15, 2021
4
1
Hello
I recently flashed pixel experience on my OnePlus 7T device and after that I relocked bootloader by flashing avb_custom_key which I found on installation instructions page of pixel experience. I have attached screenshot.

Now I am not able to unlock bootloader again as OEM unlock option is not present in developer mode and when I give fastboot command " fastboot OEM unlock " I get error message " flashing unlock not allowed ".

Please help me solve this issue.

Thanks
 

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HueyT

Senior Member
Apr 3, 2014
4,002
1,897
New Albany, IN
OnePlus 7T
Try msm to convert TMobile to Global which let's u unlock bootloader--in guides section

 

abckbc

New member
May 15, 2021
4
1
My PC is not detecting my device in EDL mode. I have installed required drivers like ADB, FASTBOOT, USB, QUALCOM QD LOADER but still not working.

Thanks
 

abckbc

New member
May 15, 2021
4
1
Try msm to convert TMobile to Global which let's u unlock bootloader--in guides section

Try msm to convert TMobile to Global which let's u unlock bootloader--in guides section

Hi,
My PC does not detect my device in EDL mode. I have installed all the required drivers like ADB, Fastboot, USB, Qelcom QD loader but still not detecting my device. However ADB and Fastboot working perfectly.
 

Eddiemc

Senior Member
Mar 15, 2010
1,417
540

Hi,
My PC does not detect my device in EDL mode. I have installed all the required drivers like ADB, Fastboot, USB, Qelcom QD loader but still not detecting my device. However ADB and Fastboot working perfectly.
Try another port or usb cable. Might sound easy/stupid, but for me that's what gets MSM tool to recognise my device.
Msm is your solution, so keep trying cables and ports/machines until you get it working. And make sure you're actually pressing the right buttons and plugging in the cable in the right order. Msm will work. Worst case you can MSM back to stock original ROM and start anew.
 

HueyT

Senior Member
Apr 3, 2014
4,002
1,897
New Albany, IN
OnePlus 7T
Key is button hold combo: phone must be off (hold vol+ and power until shuts off). Only then hold vol- and vol+ TOGETHER while plugin USBC with msm software running already. When u here the recognized tone, then click start on msm
 

abckbc

New member
May 15, 2021
4
1
Try another port or usb cable. Might sound easy/stupid, but for me that's what gets MSM tool to recognise my device.
Msm is your solution, so keep trying cables and ports/machines until you get it working. And make sure you're actually pressing the right buttons and plugging in the cable in the right order. Msm will work. Worst case you can MSM back to stock original ROM and start anew.
Try another port or usb cable. Might sound easy/stupid, but for me that's what gets MSM tool to recognise my device.
Msm is your solution, so keep trying cables and ports/machines until you get it working. And make sure you're actually pressing the right buttons and plugging in the cable in the right order. Msm will work. Worst case you can MSM back to stock original ROM and start anew.
Hi,
My problem solved. I tried on another PC and it worked. I flashed the stock rom using MSM tool and then unlocked the bootloader again. Thanks everyone for your support.
 
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    Try another port or usb cable. Might sound easy/stupid, but for me that's what gets MSM tool to recognise my device.
    Msm is your solution, so keep trying cables and ports/machines until you get it working. And make sure you're actually pressing the right buttons and plugging in the cable in the right order. Msm will work. Worst case you can MSM back to stock original ROM and start anew.
    Try another port or usb cable. Might sound easy/stupid, but for me that's what gets MSM tool to recognise my device.
    Msm is your solution, so keep trying cables and ports/machines until you get it working. And make sure you're actually pressing the right buttons and plugging in the cable in the right order. Msm will work. Worst case you can MSM back to stock original ROM and start anew.
    Hi,
    My problem solved. I tried on another PC and it worked. I flashed the stock rom using MSM tool and then unlocked the bootloader again. Thanks everyone for your support.