To reset the phone, you will need to use a key combination. Turn off the phone and then use the following instructions to hard reset the phone:
Hold Volume Up + Power.
Show hard reset mode
Release all the buttons
Press Power 3 times in a row
Press Volume + Home button
Select Wipe
Reboot the phone.
At this time the phone should reboot. Once it boots, configure it again with the Google account and that's it.