Steps:
- Flash OxygenOS v9.0.11 using
MsmDownloadTool V4.0_factory_patched.exe
- After device is back to the home screen, move
OnePlus6TOxygen_34_OTA_024_all_1909112343_9fd6e0057b8747dc.zip
to Internal Storage - Goto System > System Updates > Gear Icon(top right) > Local Upgrade, and install the OTA you just moved to Internal Storage
- After devices is updated and rebooted, go back to System Updates and there will be an update to OOSv10^, install it
- After that is installed, goto About Phone and tap Build Number until it gives you developer mode.
- Goto System > Developer options , and enable OEM Unlocking, Advanced Reboot, and USB Debuging
- Use
adb/adb.exe
to boot the phone into fastboot, using./adb.exe reboot bootloader
(It will start the daemon and then fail, the phone will ask you if you trust the computer, tap yes and rerun the command) - When in fastboot, open Device Manager (Win+X, click Device Manager), and go to Other Devices, if the phone is called Android and has a little triangle symbo