Downgrade Oneplus 9 To Android 11 Jun 2026

Select the Android 11 rollback package you moved to your storage. Confirm the installation and the data wipe warning. The phone will take 10–15 minutes to install the package.

A warning will appear stating this will reset the device. Tap Install Now

Download and install the official tool. Open the newly installed System Update application. Tap the Gear Icon in the top right corner. Locate and select your downloaded Android 11 .zip file. Confirm the selection and tap Install . Let the installation process run until it hits 100%. Step 4: Finalize and Reboot

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Ensure the downloaded file ends with a .zip extension. If your browser automatically renames it to .jar , rename the file back to .zip . Step 3: Move the File to Internal Storage

Historically, OnePlus allowed "Local Upgrades." You would place the .zip file in the root of your internal storage and select it in the System Updates menu (tap the gear icon -> Local Upgrade).

Look for the OnePlus 9 Android 11 rollback package tailored for Global/NA variants. Select the Android 11 rollback package you moved

Move the downloaded .zip rollback package to the root directory of your phone's internal storage (not inside any folders). Step 2: Install the Rollback Application (APK)

If "Local Upgrade" isn't showing in your menu, you might need to use OnePlus's dedicated Rollback APK.

When the device boots up, you will see the original OxygenOS 11 welcome screen. Complete the initial setup process. A warning will appear stating this will reset the device

Ensure you download the EU zip file to avoid network compatibility issues.

What is your (e.g., LE2111, LE2113, LE2115)? What error message or screen are you currently seeing?

Use if downgrade fails or device is soft-bricked.

Ensure your two-factor authentication (2FA) apps are backed up or temporarily disabled so you do not get locked out of your accounts after the reset. 2. Verify Your Device Model