you backup using k-tool?
if yes go dl back the app and choose restore
then restart

Try have a look at this

[GUIDE] Recover your IMEI in 9 steps

http://forum.xda-developers.com/showthread.php?t=1264021

try restore few time before restart
happen to me before i needed to restore few time then restart only able get back imei

or else i think market got apps that able to help restore imei too
but name of the app cant remember

GSII_Repair
https://play.google.com/store/apps/details?...e=search_result

guys, try help me..

suddenly this morning, my phone shows no sim detected..
the icon on the top right corner of the status bar..

i tried the sim on other phone, still can use..
but put in my SGSII then kenot detect..

put other sim into the slot also kenot detect..

hardware failure?
i had done:
- wiped the system
- wipe the cache / dalvik
- format system
- format cache
- re-install CheckROM v6

still cannot detect..

in the guide: http://forum.xda-developers.com/showthread.php?t=1264021

i cant find anything in my efs folder