If you are currently on Android 13 or 14 and need to rollback, the process is similar but may require a two-step rollback process (13 -> 12 -> 11). If you have encountered specific errors during this downgrade, please share the error message in the comments below! Frequently Asked Questions
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.
Charge your OnePlus 9 to at least to prevent sudden shutdowns. downgrade oneplus 9 to android 11 exclusive
: A common technical hurdle involves file extensions; some downloaders add a
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. If you are currently on Android 13 or
Some users report a 10-15% improvement in battery life on Android 11 compared to newer versions. It also avoids some of the aggressive app throttling discovered in later "optimizations".
Before you touch a single file, understand these three non-negotiables: Phase 2: Installing the Rollback (Downgrade) Open the
A warning screen will appear reminding you that this action completely wipes your storage. Confirm and tap .
The simplest and safest method for downgrading is using an official OnePlus rollback package. These are signed ZIP files that allow you to revert from Android 12 to a specific Android 11 build using the phone’s built‑in System Updater.
Downgrading your device can have some risks and consequences, including:
Power off the device. Hold to enter Recovery Mode. Select Wipe Data/Factory Reset . ✅ Downgrade Complete