Move or copy the file out of the Downloads folder and paste it directly into the root directory (the main folder that appears when you first open your storage). Step 3: Trigger the Local Upgrade Process
Look for the OnePlus 9 Android 11 rollback package tailored for Global/NA variants.
Find the appropriate rollback package for your OnePlus 9 variant from verified community sources like the OnePlus Community Forums or XDA Developers. Download the official .zip file.
Download the rollback ZIP package to your computer and move it to the root directory of your phone's internal storage (not inside any folders). Phase 2: How to Downgrade OnePlus 9 to Android 11 OnePlus uses a "Local Update" feature to facilitate this. Downgrade Oneplus 9 To Android 11
This is the official method provided by OnePlus. It is a straightforward process, but it's important to note that it may also wipe your data. It's best for users who want to downgrade from a stable Android 12 build to Android 11.
Many users choose to roll back to Android 11 to improve their daily experience. Based on community feedback, here are the most common reasons for downgrading:
Verify SHA256 after download.
Download the IN-specific firmware to retain local features like carrier aggregation configurations.
OxygenOS 11 will immediately detect newer software versions and attempt to download Android 12 or 13 again automatically. To preserve your Android 11 setup, navigate to > System > System Updates , tap the gear icon, and switch off Auto-download over Wi-Fi . If you ran into any snags during the process, let me know: Your exact OnePlus 9 model number (e.g., LE2111, LE2115) Your current Android version (Android 12 or 13) The error message you saw on the screen
A warning prompt will appear telling you your data will be erased. Select Confirm . Reboot: Once the installation finishes, select Reboot . Phase 3: Post-Downgrade Setup Your phone will now boot into Android 11 (OxygenOS 11). First Boot: The first boot may take up to 10–15 minutes. Move or copy the file out of the
This is the official, and generally safer, method supported by OnePlus for downgrading from a newer version to an older one. It involves using a special rollback ZIP file and the Local Update app. This method will also wipe all your data, but it's less technical than using the MSM Tool.
Did you run into any "Verification Failed" errors during the local install?
Select the rollback package, review the data wipe warning, and tap . Once the installation finishes, tap Reboot . Step 4: Initial Setup and Disabling Auto-Updates Download the official
# Reboot to bootloader adb reboot bootloader
: You will need the correct downgrade package for your specific device model. Go to Settings > About Phone to find your model number (e.g., LE2115 for North America, LE2113 for Europe, LE2111 for India). Using the wrong package can cause errors.