Hello, anyone who may concerns. I got a serious problem with my G900H and I cannot solve... Who might help me? This is the first time I use the Samsung phone and I have known it is very important to back up my EFS and I did it with a tool called Samsung tool. I just installed it and pressed the button for backing up to the internal storage. However, I cannot find the back-up so I considered it is useless. Then I uninstalled it and it is after I unloaded it, **** happened... Once I dial a number, a sentence ' Not registered on network' will come up. I do not know why and I restore factory settings, which is proved to be useless. Then I flashed a stock ROM by Odin and expected it will be better. However, the problem still persists and even I lost my IMEI, which turned to be '00499901.....' 
After that, I tried some other ROMs, the problem still has not be solved. Everything goes well but this. I wonder some smart guys may help me. Thank you very very much!
( I am not a English speaker, forgive my pool English)
After that, I tried some other ROMs, the problem still has not be solved. Everything goes well but this. I wonder some smart guys may help me. Thank you very very much!( I am not a English speaker, forgive my pool English)
