To downgrade your OnePlus 9 Go to product viewer dialog for this item.
to Android 11 (OxygenOS 11), you must use a specific Rollback Package. ⚠️ Critical Warnings
Data Wipe: This process will erase all data on your phone. Back up your photos, contacts, and files before starting.
Regional Accuracy: You must use the rollback file that matches your specific model (IN, NA, or Europe). Step 1: Download Required Files
Rollback Package: Visit the OnePlus Community forums or official support pages to download the correct OxygenOS 11 rollback zip for your region (India, North America, or Europe).
Local Update APK: Since newer OxygenOS versions (12+) often hide the "Local Upgrade" option, you may need to install the OnePlus Local Update Tool. Step 2: Prepare the Package
Move the File: Once the rollback zip is downloaded, move it to the root directory of your phone's internal storage (do not put it in a folder).
Rename (If needed): Ensure the file ends in .zip. If it ends in .jar, rename it to remove the .jar suffix. Step 3: Install the Downgrade Open the Tool: Open the Local Update APK you installed. Downgrade Oneplus 9 To Android 11
Select the Package: Tap the gear icon (top right) and select the rollback package you moved to the root directory.
Confirm & Install: The system will warn you that this will reset the device. Tap Confirm.
Reboot: Once the installation reaches 100%, tap Reboot. Your phone will restart into the initial setup for OxygenOS 11. Why People Downgrade Users often revert to Android 11 for: Stability: Fixing bugs found in later OxygenOS versions.
Interface Preference: Returning to the "classic" OnePlus UI before the merger with ColorOS.
Performance: Resolving battery drain or heating issues caused by newer updates. If you'd like, I can help you find:
The exact download link for your specific region (IN, NA, or EU).
Tips on how to stop automatic updates once you're back on Android 11. The best backup tools to use before you wipe the device. To downgrade your OnePlus 9 Go to product
Downgrading OnePlus 9 to Android 11: A Step-by-Step Guide
The OnePlus 9 series was launched with Android 11 out of the box, and later received updates to Android 12 and even Android 13. However, there may be reasons why you want to downgrade your OnePlus 9 to Android 11. Perhaps you're experiencing issues with the newer version, or you prefer the familiarity of Android 11. Whatever the reason, downgrading your device can be a bit tricky, but it's doable. In this article, we'll walk you through the process.
Why Downgrade to Android 11?
Before we dive into the process, let's discuss some reasons why you might want to downgrade to Android 11:
Preparation
Before you start the downgrade process:
Downgrade Process
To downgrade your OnePlus 9 to Android 11, you'll need to:
OnePlus officially provides "Rollback Builds" (downgrade packages) for users who want to revert from beta or stable Android 12/13/14 to Android 11.
Where to find them:
Example file name: Rollback_OxygenOS_11.2.10.10.LE15DA_210923.ozip
If your OnePlus 9 is already bricked, stuck in a boot loop, or the local update method fails, you need the MSM Download Tool. This is a PC-based utility that flashes the phone back to factory Android 11.
Warning: This tool is for emergency use only. It wipes everything and restores the phone to exactly how it left the factory.