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Move all critical media to a cloud service or an external computer hard drive.
By following this guide, you'll be able to downgrade your OnePlus 9 to Android 11 exclusively. However, we recommend you to proceed with caution and consider the risks and consequences before making any changes to your device. downgrade oneplus 9 to android 11 exclusive
Confirm the installation. The phone will verify the file and then begin the process, which usually takes 5–10 minutes.
: If your phone becomes unresponsive or "bricked," you may need to use the MSM Download Tool on a PC to force-flash the original firmware. Verification : After the first boot, go to Settings > About Phone to confirm you are on Android 11. for your region's rollback package? Oneplus 9 Pro | Downgrade to OXYGEN OS 11 This public link is valid for 7 days
Verify the file extension. If the file ends with .jar , rename it to change the extension to .zip .
Ensure your 2FA apps (like Google Authenticator or Microsoft Authenticator) are backed up or tied to a cloud account so you do not lose access to your personal accounts. Step 2: Download the Official Android 11 Rollback Firmware Can’t copy the link right now
Since OxygenOS 12 and 13 often hide the local upgrade option, you may need a dedicated Local Update APK to facilitate the flash. Prepare Files:
Open the default app or any third-party file manager on your OnePlus 9.
Before starting, ensure you have taken the following precautions:
You need the official OnePlus rollback package specific to your region. These are special .zip files designed to trigger the local upgrade utility. Official Regional Rollback Packages