: This process will erase everything on your device, including photos, apps, and settings.
The OnePlus 9 series was launched with Android 11 out of the box, and later received updates to Android 12. However, if you're looking to downgrade your OnePlus 9 to Android 11, we've got you covered. In this guide, we'll walk you through the process of downgrading your device to Android 11.
Android 11 offers more granular control over individual app icons and status bar personalization, features that were removed or restricted in later versions. Battery Life: downgrade oneplus 9 to android 11 exclusive
You need to download the official rollback package provided by OnePlus. These are large .zip files containing the full Android 11 factory image.
Path B — Fastboot flash (advanced; use when official local rollback isn’t available): : This process will erase everything on your
Newer OxygenOS versions hide the local installation menu. You must enable Developer Options to reveal it, or install a specific OnePlus legal installation APK if the option remains missing. Unlocking Developer Options Go to . Tap Build Number 7 times consecutively. Enter your lock screen PIN when prompted. Triggering the Downgrade Go back to Settings > System (or System Settings ). Tap System Updates or Software Update .
A warning prompt will remind you that this action erases all data. Confirm and select . In this guide, we'll walk you through the
If your browser saves this file as LocalUpdate.zip , you must use a file manager application to rename it to LocalUpdate.apk by removing the .zip suffix. 2. Official Android 11 Rollback Firmware
No, for the official rollback methods described above, you do NOT need to unlock your bootloader. These are signed OnePlus packages that install without bootloader modifications.
Check your specific model number in Settings > About Device (e.g., LE2111 for India, LE2113 for Europe, LE2115 for North America). Downloading the wrong regional firmware will brick your phone. Step 1: Download the Official OnePlus 9 Rollback Firmware