Nokia Lumia 520 - How to remove security code by hard reset

Warning! Do this at your own risk! All your phone data (conts,photos,videos,music,messages,aplications,games,files,) will be lost! Please make backup first if you can!\r
1.Power off your phone\r
2.Press power button and after phone vibrates once press volume down until you will see exclamation sign on the screen\r
3.Press in this order:volume up volume down power volume down\r
4.Wait until format ends and the phone restarts\r
Thats it\r
If you reset your Nokia Lumia and when booting the handset, you simply cannot get past the spinning gears, we have here the solution to fix this problem:\r