If you want to bypass to many pattern attempts lock on Samsung Grand Quattro GT-i8552 cellphone then try this trick to unlock screen pattern lock. This trick will also same related models. You can remove pattern lock without full reset mobile or formating mobile. All data installed apps and games, settings will not removed by this trick.
1. Power off mobile.
2. Press and hold Volume Up + Home + Power button together for some seconds.
3. Release Keys when android logo appear.
4. With volume keys select “Wipe data factory reset” and press power to confirm.
5. Select with volume keys “Yes….delete all user data” and press power to confirm.
6. When format complete reboot mobile to complete the method.