: Since Android 12 and 13 often hide the local upgrade option, you must download a specific Local Update APK
Ensure the file extension ends strictly in .zip . If it ends in .jar , rename the file and delete the .jar suffix. Step 2: Access the Local Upgrade Menu
Enable or use OnePlus Switch / Clone Phone to transfer a backup file to an external hard drive or computer.
Verify the file extension. If the file ends with .jar , rename it to change the extension to .zip . downgrade oneplus 9 to android 11 exclusive
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Ensure your device has at least before starting. Downgrade processes can take 15-30 minutes, and a power interruption mid-process could permanently brick your device.
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. : Since Android 12 and 13 often hide
How to Downgrade OnePlus 9 to Android 11: A Complete, Step-by-Step Guide
: You must download the correct firmware package for your specific region (IN, NA, or Europe) from the official OnePlus Community Install the Local Update APK
Connect your OnePlus 9 to a computer using a USB cable. Select File Transfer mode on your phone, and copy your DCIM , Pictures , Downloads , and Documents folders directly to your computer's hard drive. Verify the file extension
Any specific you encounter during the process.
Ensure you back up two-factor authentication (2FA) apps like Google Authenticator. 2. Check Device Prerequisites