There could be several reasons why you might want to downgrade your OnePlus 9 to Android 11:
Copy the rollback ZIP file to the root of your internal storage (not inside any folder). Then, install the OnePlusLocalUpdate_for_Android12.apk (this is the hidden system updater). Open the app, select the ZIP file, and confirm.
Select from the USB notification dropdown menu.
After the installation finishes, tap . Your device will boot into recovery, perform a factory reset, and eventually start up with the OxygenOS 11 setup screen. downgrade oneplus 9 to android 11 exclusive
Go to Settings > About Device > Version and tap Build Number 7 times. Install the OnePlus Local Update APK:
A warning screen will appear reminding you that this action completely wipes your storage. Confirm and tap .
Navigate to your folder to locate the firmware package. There could be several reasons why you might
The installation process takes roughly 10 to 15 minutes. Once finished, tap . Your OnePlus 9 will boot into the classic OxygenOS 11 setup screen.
You must download the package that matches your specific region: : Official Rollback Package India (IN) : Official Rollback Package Europe (EU) : Official Rollback Package
: Ensure your OnePlus 9 has at least 50% battery to prevent the device from shutting down mid-flash, which could lead to a permanent "brick". Select from the USB notification dropdown menu
Downgrading your OnePlus 9 to Android 11 can be a bit tricky, but with the right guidance, you can achieve it. Make sure to follow the steps carefully and take necessary precautions to avoid any risks or consequences. If you're not comfortable with the process, it's recommended to stay with Android 12 or wait for future updates.
One final recommendation: after downgrading, stay on the latest Android 11 security patch available (ending around version 11.2.10.10 for most regions). While these patches are no longer the newest available, they provide a balanced experience for daily use.
To downgrade your OnePlus 9 to Android 11, follow these steps carefully: