One click: Start.
| Action | Why It Matters | |--------|----------------| | | Go to Settings → System → System Updates → Disable "Auto-download over Wi-Fi" | | Check for correct baseband | Dial *#*#786#*#* – ensure your IMEI is intact (should be fine with official rollback) | | Reinstall camera app updates | Open Google Play → Update OnePlus Camera – the rollback ships with an older version | | Test critical functions | Wi-Fi, Bluetooth, fingerprint sensor, and alert slider |
Find the official Android 11 rollback ZIP for your model on the OnePlus Community forums or authorized mirrors like XDA Developers .
Before we discuss the how , let’s discuss the why . Understanding this helps validate your decision. Downgrade Oneplus 9 To Android 11
Do you have a unique error while trying to downgrade? Check the OnePlus Community forums or XDA Developers for device-specific rollback threads updated for your exact build number.
Select the rollback package you just moved to the root storage. Confirm and Wipe:
Once the phone restarts, it may take some time as it is performing a full system downgrade. Once it boots, it will be back on Android 11 with OxygenOS 11. One click: Start
Tap on the rollback .zip file you moved to your root directory in Step 2.
What (12 or 13) your phone is running The exact model number from your settings Any error messages that popped up I can give you specific steps to get past the issue. Share public link
, which is a specialized utility for unbricking and deep downgrades via a Windows PC. This requires a computer and puts the phone into "EDL mode" by holding both volume buttons while connecting it via USB. Oneplus 9 Pro | Downgrade to OXYGEN OS 11 Understanding this helps validate your decision
You will lose access to the latest security patches and potentially newer app features only available on Android 12/13/14. Technical Difficulty:
, keyboard calibration, and haptic feedback that some users found "broken" in newer updates. Cons: The Risks Data Wipe: mandatory factory reset . You must back up everything externally before starting. Security Risks:
Copy the downloaded Android 11 rollback .zip file from your computer.