I can provide the exact firmware download links or offer troubleshooting steps for your specific scenario. Share public link
you downloaded. You may need to enable "Install from Unknown Sources" in your security settings. Initiate Rollback Local Update
To downgrade your Go to product viewer dialog for this item.
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. downgrade oneplus 9 to android 11 exclusive
Many users choose to roll back their devices to OxygenOS 11 because they prefer its classic UI design, require specific legacy app compatibility, or want to resolve severe battery drain and performance throttling introduced in newer updates. This comprehensive, step-by-step guide will safely walk you through the entire rollback procedure without bricking your device. Phase 1: Essential Pre-Downgrade Checklist
How to Downgrade Go to product viewer dialog for this item. to Android 11: The Ultimate Exclusive Rollback Guide You can successfully downgrade your
Before you start, please make sure you have the following in place: I can provide the exact firmware download links
To prevent your OnePlus 9 from immediately re-downloading Android 12 or 13, you need to turn off automatic background updates. Navigate to .
to the end of the APK or firmware. You must rename these files to end strictly in (for the tool) or (for the firmware) for them to be recognized. Executing the Rollback : Once the firmware package is placed in the main page of internal storage
The local upgrade method using official OnePlus rollback packages is the easiest and safest way to downgrade your OnePlus 9 from Android 12 or newer to Android 11. Initiate Rollback Local Update To downgrade your Go
To downgrade your Go to product viewer dialog for this item.
Once you are on OxygenOS 11, the phone may immediately ask to update back to Android 12/13.
Last tested: OnePlus 9 LE2115_11_C.15 (Android 11) downgraded from LE2115_13_F.75 (Android 13).