Downgrade OnePlus 9 from Android 14_to_11
Downgrading OnePlus 9 Android 14_to_11:
⚠️ Warning: This will erase all data. Backup first!
- Unlock bootloader (required for flashing)
- Download the factory image for target Android version
- Install ADB/Fastboot on your computer
- Boot to Fastboot mode on your OnePlus 9
- Run commands:
fastboot flash bootloader bootloader.img
fastboot reboot-bootloader
fastboot flash radio radio.img
fastboot reboot-bootloader
fastboot -w update image.zip - Reboot and complete setup
Pro Tips:
- Use original USB cable for stable connection
- Ensure battery is at least 50% charged
- Double-check file names match your device
Caution: Downgrading will erase all data on your device. Make sure to back up your data before proceeding.