Question

how to open hard password lock​

Answer 1

Answer:

with every passlock their is a back-up pin

if you know that pin then that's all

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Answer 2

Explanation:

first enter an incorrect pattern or PIN five times at the lock screen. You'll see a “Forgot pattern,” “forgot PIN,” or “forgot password” button appear. Tap it. You'll be prompted to enter the username and password of the Google account associated with your Android device.

Hope it will help you