Downgrade Oneplus 9 To Android 11 __link__ -

To downgrade your OnePlus 9 to Android 11 (OxygenOS 11), you must use a official rollback package. This process will completely wipe all data on your device, so a full backup is mandatory before starting. Prerequisites

Step 2: Move ZIP to Root of Internal Storage

• Copy the .zip file (do not rename or extract) to /sdcard/
• Do not put it inside any folder

Error: "Can't downgrade because software is newer"

Cause: You are trying to downgrade from Android 13 or OxygenOS 13.1 directly to Android 11. Fix: You must first downgrade to Android 12 (OxygenOS 12) using an intermediate rollback package, then downgrade to Android 11. OnePlus blocks direct major version downgrades. Downgrade Oneplus 9 To Android 11

Once finished, tap Reboot. The device will boot into recovery, perform a factory reset, and then restart into OxygenOS 11. Advanced Method: MSM Download Tool Oneplus 9 Pro | Downgrade to OXYGEN OS 11 To downgrade your OnePlus 9 to Android 11

Don’t downgrade if:

1. Backup your data: Downgrading your device will erase all data, so make sure to backup your important files, contacts, and photos to a cloud storage service like Google Drive or a computer.
2. Charge your device: Ensure your OnePlus 9 is fully charged or at least has 50% battery life to avoid any interruptions during the process.
3. Install necessary tools: You'll need to install the OnePlus USB driver and the Android Debug Bridge (ADB) on your computer.