Try turning off Wi-Fi and mobile data, then clear the data for the "Software Update" app in your system settings.
The OnePlus 9 series launched to critical acclaim in 2021, primarily for its Hasselblad-tuned cameras and blazing-fast Snapdragon 888 chipset. However, for many users, the magic lived in —the operating system that shipped with the device out of the box. Downgrade Oneplus 9 To Android 11
If "Local Upgrade" isn't showing in your menu, you might need to use OnePlus's dedicated Rollback APK. Try turning off Wi-Fi and mobile data, then
: Ensure all photos, messages, and files are backed up to a cloud service like Google Photos or an external drive. Battery Level : Keep your device charged above to avoid power failure during the flash. Remove Security for many users