[Q] i9300 No network IMEI correct

I instal official ROM for KIES Recovery Android 4.1.2 (I9300XXEMG4) . My IMEI is correct but my network don't work only emergy call.
How i fix this problem? :(

I read this post http://forum.xda-developers.com/show....php?t=2393289 but do not understand.

Please Help.