Warning! All data will be lost!
1.Turn off your phone
2.Press together volume up + power button until the android logo appears on display
3.Browse with volume buttons and select "wipe data/factory reset" then press power button
4.Select "yes" and press power button
5.Wait until format is complete
6.Select "reboot" and press power button
7.Wait until the phone restarts
Here is video how to do:http://""""""""""""""""""""""/
1.Turn off your phone
2.Press together volume up + power button until the android logo appears on display
3.Browse with volume buttons and select "wipe data/factory reset" then press power button
4.Select "yes" and press power button
5.Wait until format is complete
6.Select "reboot" and press power button
7.Wait until the phone restarts
Here is video how to do:http://""""""""""""""""""""""/