ROM Signal lost?? topic

After installing custom roms like Cyanogen or paranoid etc. I lost my IMEI and unable to recover. So I flashed recovery again and back to normal. I did researched and tried a lot of times but still lost the signal. I am using Samsung i9300 (s3).

Like this
BASEBAND VERSION :UNKNOWN
IMEI:UNKNOWN

I also tried to use EFS pro to restore IMEI. However there are no effects.

So how can I solve this issue with custom MOD? Please help.