GD55/G50/G51/G70/A100/A101/A102/X300: with or w/o SIM press *#369# and go to menu ?°SW Version?± - GD67/GD87/X60/X66/X100/X200/X400/X500: with SIM press *#9999# while phone searching for network - X200 : with SIM press #02# while phone searching for network - X6X : Power on the phone with valid sim card and tape this code : 52824** then tape 746, Menu, Menu then enter your code
