Downgrade Oneplus 9 To Android 11 -

fastboot flash boot boot.img fastboot flash dtbo dtbo.img fastboot flash vendor vendor.img fastboot flash system system.img fastboot flash userdata userdata.img # Wipes data fastboot flash vbmeta vbmeta.img --disable-verity --disable-verification fastboot -w fastboot reboot

The results were a minefield. XDA Developers threads. YouTube videos with titles like "DON'T TRY THIS AT HOME" and "BRICK FIX TUTORIAL." Warnings everywhere: This will wipe your data. This will void your warranty. You might end up with a paperweight. Downgrade Oneplus 9 To Android 11

Go to . Note the model number:

Download the official OnePlus 9 Android 11 Rollback Package for your region. If the file ends in .jar , rename it to end in . fastboot flash boot boot

Downgrade any Oneplus Phone from OxygenOS 13 to Stable OxygenOS 12 Downgrade Oneplus 9 To Android 11