Procedure:
Power off your phone
Press together volume up and Volume Down then press power button
Select Recovery mode with taping the menu button as shown in picture.
Choose with volume buttons "wipe data/factory reset" and select it with menu key
Choose "yes delete all" with volume buttons and select it with menu button
Select "reboot"
Wait until the phone restarts.
http://s1060.photobucket.com/user/0704kenken/media/download1.jpg.html?filters[user]=128202724&filters[recent]=1&sort=1&o=0
done
Power off your phone
Press together volume up and Volume Down then press power button
Select Recovery mode with taping the menu button as shown in picture.
Choose with volume buttons "wipe data/factory reset" and select it with menu key
Choose "yes delete all" with volume buttons and select it with menu button
Select "reboot"
Wait until the phone restarts.
http://s1060.photobucket.com/user/0704kenken/media/download1.jpg.html?filters[user]=128202724&filters[recent]=1&sort=1&o=0
done