If it downloads as a .zip , rename it to before installing. 3. Execute the Rollback [CLOSED] Roll back - OnePlus Community
Ensure your phone is charged to at least 30% (60% is recommended) to prevent power loss during the flash. Downgrade Oneplus 9 To Android 11
Before beginning, ensure you meet these requirements to avoid bricking your device: If it downloads as a
to Android 11. This process is useful for troubleshooting bugs or preparing for custom ROM installations, but it will . Essential Prerequisites If it downloads as a .zip
Download the official OnePlus 9 Android 11 Rollback Package for your region. If the file ends in .jar , rename it to end in .