A. If you are on OOS 10 or higher
Latest TWRP image and installer zips from here
Oxygen OS full update zip
Latest Magisk zip
Reboot to fastboot mode. Flash TWRP image using the following command...
Magisk v20.1 has been pushed to the stable channel. This update fixes the issue with TWRP disappearing
This method will also apply to other OnePlus phones with A/B partitioning scheme. That is, 6/6T/7/7Pro/7T
1. Download full OOS zip for your device here. Put it on the root of the Internal storage. (And no, incremental OTA zips won't work)
Android 10 set to English (US)
Debloat (Terminal Emulator) Magisk module
Termux or Terminal Emulator
Download import-debloat.txt from the attachment below.
Open Terminal. Type the following commands, one by one