For the purist who misses the "Fast and Smooth" era of OnePlus, downgrading the OnePlus 9 to Android 11 is a breath of fresh air. It restores the UI to its intended form and often resolves the thermal throttling introduced by the ColorOS merge.
I can provide the exact firmware download links or offer troubleshooting steps for your specific scenario. Share public link
Ensure your device has at least before starting. Downgrade processes can take 15-30 minutes, and a power interruption mid-process could permanently brick your device. downgrade oneplus 9 to android 11 exclusive
In cases where the software fails entirely, the community relies on the MSM Download Tool
For many OnePlus 9 owners, returning to Android 11 brings back a snappier, more reliable experience. The phone’s original software was refined over months, and for some users, it simply works better than the newer Android 12 or 13 builds. For the purist who misses the "Fast and
Find and select the Android 11 rollback .zip file you placed in the root directory.
The Android 11 installation file for your region. Share public link Ensure your device has at
Once the file is downloaded to your computer or your phone's download folder, you need to place it in the correct location so the system updater can see it.
Copy the downloaded Android 11 rollback .zip file from your computer.