Downgrade Oneplus | 9 To Android 11

Downgrading your OnePlus 9 to Android 11 (OxygenOS 11) is a common move for users looking for better stability or a specific interface style This process will completely wipe your phone , so ensure you have a full backup before starting. Pre-Downgrade Checklist Backup Everything:

Step 2: Flash Android 11 Firmware

1. Download the Android 11 firmware for your OnePlus 9 from the official OnePlus website or a reputable source.
2. Extract the firmware package to a folder on your computer.
3. Navigate to the platform-tools folder and type fastboot flash --type --recovery recovery.img to flash the recovery image.
4. Type fastboot boot recovery.img to boot into recovery mode.
5. In recovery mode, select the Install update option and choose the Android 11 firmware package.
6. Follow the on-screen instructions to complete the installation.

Once the installation finishes, your phone will prompt you to Restart. It will boot into recovery mode, perform a factory reset, and then restart into the OxygenOS 11 setup screen. Alternative: The MSM Download Tool Downgrade Oneplus 9 To Android 11

Why Downgrade to Android 11?