Originally Posted by ceesheim
Looks like you have a developers phone , 2 things :
1) security unlocked
thats why I think its a dev phone and that explanes why you can't downgrade.
I confirmed that imei is US and flashed asia rom and updated to gdr3 before,so i think it likes the normal phone.In my mind,a dev phone may be more free than normal,but I can't do nothing.Anyway,thanks for your reply.