By following this guide, you'll be able to downgrade your OnePlus 9 to Android 11 exclusively. However, we recommend you to proceed with caution and consider the risks and consequences before making any changes to your device.

After the installation finishes, tap . Your device will boot into recovery, perform a factory reset, and eventually start up with the OxygenOS 11 setup screen.

When downloaded, your phone or computer may automatically append .jar to the end of the file name. Open your file manager. Locate the downloaded file. Long-press the file and select .

Warning: This will wipe your device, void warranty, and can brick your phone. Proceed only if you accept the risks.

You need the specific rollback package for your model (LE2111/13/15).

Chapter 1 — Prepare like a craftsman