Step 4: Flash the Downgrade Package
Step 5: Wipe Data and Cache
Step 1: Enable Developer Options and USB Debugging Downgrade Oneplus 9 To Android 11
Downgrading your device will erase all data on your device. Make sure to back up your crucial data, such as contacts, photos, and messages, to an external storage device or cloud storage service. Downgrading may also cause issues with certain apps that have been updated to work with Android 12. You may experience compatibility issues or lose access to certain features. Step 4: Flash the Downgrade Package Step 5:
Step 3: Boot into Fastboot Mode
Run the command adb reboot bootloader to power your device into Fastboot mode. Wait for your device to boot into Fastboot mode. such as contacts
Step 6: Reboot and Set Up Your Device