how to remove Vivo V15 (1819) pin pattern password Android 9.0 Without Box and without flash

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how to remove Vivo V15 (1819)  pin pattern password Android 9.0 Without Box andwithout flash (no need to online)

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how to remove Vivo V15 (1819)  pin pattern password Android 9.0 Without Box and without full flashing 

this is only for your own mobile (education purpose only)

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