to Android 11. This process is useful for troubleshooting bugs or preparing for custom ROM installations, but it will . Essential Prerequisites
Download the official OnePlus 9 Android 11 Rollback Package for your region. If the file ends in .jar , rename it to end in . 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. to Android 11
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
OnePlus removed the local install option in newer updates. You must download and install the to restore this feature. Download the APK from the OnePlus Community forums.