You will see a warning list of all data that will be removed. Confirm by tapping Reset Phone or Clear All Data .
Tap on Backup & Reset (or "Reset Phone"). How to Hard Reset VIVO X9s
The phone may ask for your security password, pattern, or PIN to verify your identity. You will see a warning list of all data that will be removed
Select Erase All Data (Factory Reset). You might also see an option like "Reset to Factory Settings." How to Hard Reset VIVO X9s