Downgrade Oneplus 9 To Android 11 Guide

This is the standard method for users currently on a stable version of OxygenOS 12 or 13.

If it downloads as a .zip , rename it to before installing. 3. Execute the Rollback [CLOSED] Roll back - OnePlus Community

If you're missing the stability or features of earlier OxygenOS versions, you can downgrade your Go to product viewer dialog for this item.