Fixed Unknown Network / No Registered Network on i9300 ( Solved )

If you happen to have a problem of EFS problem with your samsung galaxy S3, you can follow this technique that actually works like a charm.

1. First, all you have to do is to download patched modem file from one of the links below :

Links : http://www.mediafire.com/download/07j72ralzjs76pz/Patched_Modem_I9300XXEMH1.zip
            http://www.datafilehost.com/d/c2332563

2. Go to recovery mode, and then install the patched modem you have downloaded earlier.
3, Reboot your device.

Hope this will work for you. Good Luck :)