Any specific you encounter during the process.
The OnePlus 9 launched with OxygenOS 11, which was widely regarded as one of the most stable iterations of the software. The upgrade to Android 12 introduced significant changes:
Select from the USB notification dropdown menu. downgrade oneplus 9 to android 11 exclusive
If you are downgrading from a much newer version (e.g., Android 14) and encountering issues, some users recommend a more cautious, staged approach:
If the rollback file is in .jar format, rename it to end in .zip . Any specific you encounter during the process
: Move photos, documents, and contacts to a cloud service or an external hard drive.
On newer OxygenOS versions, the "Local upgrade" option is hidden. Download and install the OnePlus Local Update APK. If you are downgrading from a much newer version (e
You must download the official rollback package specific to your region. Download these files directly onto your OnePlus 9 internal storage, or transfer them from a computer via USB. Official OnePlus 9 Rollback Packages
Review the warning that your data will be deleted, and tap . Step 4: The Flashing Process and First Boot
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
Path A — Official local rollback (recommended if OnePlus provides an official rollback package for your build):