1) Try to guess the pattern several times.
2) After about 5 incorrectly drawn patterns it will lock you out and tell you to try again later.
3) But you will now notice that on the bottom right of the screen you now have the option to select “Forgot Pattern”.
4) Click “Forgot Pattern”.
5) Enter your Google account Username and Password that you use on the device.
6) Click “Sign In”.
7) You’ll now have the ability to Draw a NEW unlock pattern.
8 ) Draw the new unlock pattern (make sure to remember it this time!)
9) Click “Confirm” on bottom right.
10) That’s it! You should now be on the home screen of your Android device with a new unlock pattern set.
source : http://droidlessons.com/how-to-reset-your-android-lock-screen-password/
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