1- First step: First of all, turn off your Vivo Y51A completely. If you can't unlock the screen, press and hold the power button for about 20 seconds and the phone will turn off. 2- Second step: Simultaneously press the power key and the volume key down on the Vivo Y51A for a few seconds. 18K views 2 years ago. How to Hard Reset Vivo Y51A Smartphone. If you forgot the security password of your Vivo Y51A, This will work for Y51A and any other Vivo Smartphone. [Factory ttoO.
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  • how to reset vivo y51a