Pattern lock is good feature to protect mobile unauthorised access, but it creates problem when we enter wrong pattern many times and mobile ask google account to reset pattern lock. If google account is set before setup of pattern lock then we easily reset pattern lock with google account otherwise only solution for that hard rest via key combination. But using this trick all data on mobile will be lost so keep backup of important data.
1.Power off your phone
2.Push together volume up+home key+power button
3.Select with volume keys "wipe data/factory reset" and press home to confirm
4.Select "yes" and press home to confirm
5.Wait until format ends
6.Press home key to confirm "reboot"
7.Wait until the phone restarts