in the menu down "Forgot your password" over Google email and password
or set Back with recovery
make Handy off.
holde Vol.up+Power for 5 sec. to go in the Recovery menü
maybe the handy boot normal,so Try again.
or. open the ADB and make "adb reboot recovery"
in the menu go with the Vol buttons down to "wipe data\factory reset" and turn Powwer.
"WARNING" Everything is cleared.....
i can not for 100% say that it work!!!
sy for my english.im from Germany