What is Hydra Tool?
Xiaomi Auth Server
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How to Factory Reset Vivo by AT Mode ?
Power on the device (Cellphone / Mobile).
Go to Dial Screen,
Go to Verification Test -> Debug Port
Now, Run "
Qualcomm" Module of Hydra Tool.
Go to "Service" Tab.
Go to "Vivo" Tab.
Choose "Factory Reset" drop down menu.
Choose "Factory Reset" on "ATE Command" Mode (You find this at the last list. )
Click "Execute" button
Wait until the operation is complete.