To downgrade your OnePlus 9 to Android 11 (OxygenOS 11), you will need to perform a local upgrade using a specific rollback package. This process will wipe all data
The Android 11 installation file for your region. downgrade oneplus 9 to android 11 exclusive
Exclusive Tip: The latest functional build for Android 13 to Android 11 is . If you are on Android 13, you cannot directly downgrade to Android 11 without first going to Android 12. The path is: Android 13 → Android 12 (using downgrade zip) → Android 11. To downgrade your OnePlus 9 to Android 11
Since Android 12 hides the "Local Upgrade" option, you must install the OnePlus Local Update Tool APK. 3. Step-by-Step Downgrade Process If you are on Android 13, you cannot
or 9 Pro) and region from sources like the OnePlus Community forums or SourceForge . Find the downloaded file in your file manager. If it ends in .jar , rename it to end in .zip .
Extract from payload.bin using:
In cases where the software fails entirely, the community relies on the MSM Download Tool