How To Reset Nokia Lumia 520 Via Keys Easy Trick

Warning!
All your phone data (contacts, photos, videos, music, messages, applications, games, files,) will be lost! Please make backup first if you can!
Unlock User Code On Nokia Lumia 520
1.Power off your phone
2.Press power button and after phone vibrates once press volume down until you will see exclamation sign on the screen
3.Press volume up then volume down then power button and volume down
4.Wait until format ends and the phone restarts