Downgrade Oneplus 9 To Android 11 Exclusive [better]

Android 12 and Android 13 hide the local installation menu by default. Follow these steps to prepare your device:

To ensure your device stays on Android 11 exclusively without auto-updating overnight: Complete the initial Android setup wizard. Navigate to . Tap the Gear icon in the top right corner.

Find and select the Android 11 rollback .zip file you placed in the root directory.

from the phone. Users are advised to use services like Google Photos or the OnePlus Switch app to secure their files before starting. The Local Update Tool downgrade oneplus 9 to android 11 exclusive

Navigate to Settings > Google > Backup and trigger a manual backup for contacts, calendar events, and app data.

: The rollback process will erase every single file on your phone, including photos, contacts, and apps. Backup everything to a cloud service like Google Photos or a PC before proceeding.

OnePlus introduced ARB in Android 11 updates. The aboot and xbl partitions contain a rollback index. Attempting to flash an older index without modification triggers: Android 12 and Android 13 hide the local

Select the Android 11 rollback package you placed in the root directory. Confirm and Install

fastboot delete-logical-partition system_a fastboot delete-logical-partition system_b fastboot delete-logical-partition product_a fastboot delete-logical-partition product_b fastboot delete-logical-partition vendor_a fastboot delete-logical-partition vendor_b

Before you begin, make sure to:

Note: If the downloaded file ends in .jar , rename it to end in .zip .

This process will completely wipe your device. Backup all photos, contacts, and documents to a cloud service or external PC.