Toggle the "Auto-download over Wi-Fi" and "Auto-update overnight" switches. Troubleshooting Common Flashing Issues
Note: Download these files directly using your phone's browser, or download them to your PC and transfer them over via USB. Step 3: Prepare the File Structure
Delete .jar from the end so the file terminates exactly in .zip . Step 2: Move the Firmware to Root Directory
Android 13 removes the native local upgrade button. You must use an official OnePlus upgrade APK utility to bypass this restriction. downgrade oneplus 9 to android 11 exclusive
The installation steps depend on whether your OnePlus 9 is currently running Android 12 or Android 13. Newer OxygenOS versions hide the local upgrade option, requiring a workaround application. Step 1: Prepare the Firmware File
This exclusive downgrade path remains the only solution.
Move the .zip Rollback Firmware to the of your phone's internal storage (not inside any folders). Phase 2: Installing the Rollback (Downgrade) Open the OnePlus Local Update application you installed. Tap the Gear Icon in the top right corner. Step 2: Move the Firmware to Root Directory
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.
Confirm the warning that all data will be erased and click . Finalize the Process : Wait for the installation to reach 100%.
This disables the system update service entirely. Newer OxygenOS versions hide the local upgrade option,
Once on the home screen, go to . Tap the Gear Icon and toggle off Auto-download over Wi-Fi .
Select from the USB notification dropdown menu.