Help upgrading Android 9 to 13 or stable version?

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Senior Member
Feb 4, 2012
My young son uses my 6t just for gaming. Right now it has TWRP 3.2.3-2 rooted with magisk and is running Android 9 Oxygen ROM Tmobile phone but its unlocked.
I'm not new to flashing but just wanted to get pointed in the right direction. I have been away from the scene for years. How do I go about flashing from Oxygen 9 to a stable Official or custom ROM on Android 13 or any stable android version for this phone?


New member
Dec 26, 2022
OnePlus 6T
Most roms require you to update to oos 11 first before flashing the custom ROMs. For android 13 I recommend crdroid which is the one I use, instructions will be on their XDA post which is on the website. I don't have the T-Mobile variant and lots of people seem to complain about it, good luck 👍