: Go to Settings > About Device > Version and tap Build Number 7 times.
On newer OxygenOS versions, the standard "Local Upgrade" option may be hidden. You might need to download and install the OnePlus Local Update APK to perform the manual install. Prepare the Files:
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: Go to Settings > About Device > Version and tap Build Number 7 times.
On newer OxygenOS versions, the standard "Local Upgrade" option may be hidden. You might need to download and install the OnePlus Local Update APK to perform the manual install. Prepare the Files: Downgrade Oneplus 9 To Android 11
