mobile

hi guys i bought an motorola razr to online site its second hand. i dont know what is the exact model of this. i dont know it is xt912 or xt910 or where it came from.when i first touch it i found in the setting its xt912 but i know it can be install in xt910 or vice versa. know it is xt910 CM 11. btw it has print in the back. i did search and i cant find about it. so guys can you help me. i attached photo TIA