Download the specific rollback package for your region (IN, NA, or Europe).
This is the standard method for users currently on a stable version of OxygenOS 12 or 13. Downgrade Oneplus 9 To Android 11
If you're missing the stability or features of earlier OxygenOS versions, you can downgrade your Go to product viewer dialog for this item. Download the specific rollback package for your region
to Android 11. This process is useful for troubleshooting bugs or preparing for custom ROM installations, but it will . Essential Prerequisites Downgrade Oneplus 9 To Android 11
All data, including photos, contacts, and messages, will be permanently deleted.
Ensure your phone is charged to at least 30% (60% is recommended) to prevent power loss during the flash.