Downgrade Oneplus 9 — To Android 11

The OnePlus 9 series, powered by the formidable Snapdragon 888, was a flagship contender that launched with Android 11 out of the box. Over time, OnePlus pushed significant updates, eventually landing on Android 12, 13, and beyond, often with the much-debated ColorOS (or OxygenOS based on ColorOS) merger.

On Android 12, the standard "Local Install" option is often hidden. You may need to download and install the official OnePlus Local Update APK Prepare the Rollback File: Downgrade Oneplus 9 To Android 11

Downgrading your from OxygenOS 12 (Android 12) back to OxygenOS 11 (Android 11) involves using a "Rollback Package" and a specific update tool ⚠️ Critical Precautions Backup Everything: This process will completely erase all data on your phone. Battery Level: Ensure your phone is charged to at least (preferably 50%+) before starting. Official Files: Only use rollback packages from the official OnePlus Community or trusted developers to avoid bricking your device. Step-by-Step Downgrade Process Download Necessary Files: Rollback Package: The OnePlus 9 series, powered by the formidable

Use cloud services like Google Drive or OnePlus Clone Phone to back up your essential data. You may need to download and install the

Since your phone will be factory reset, you must secure your files first.

: This guide is for educational purposes only. Downgrading your device is done at your own risk. The author and this blog are not responsible for any damage or issues that may arise during or after the downgrade process.

As of 2025, Android 11 is technically outdated. You will miss out on security patches newer than February 2024 (depending on your final build). However, for many, the and performance of Android 11 on the OnePlus 9 outweigh the theoretical security risks—especially if you avoid downloading suspicious APKs.