SIM card wont register on phone.

Hey all..

I had a weird thing happen to me today, my s3 GT-i9300 wont register the sim at all it all started when I flashed 4.3 from 4.0 today I've tried everything possible to get the sim to register. In all honesty, I've become discouraged and would be happy to just get back to stock rom... at least the network was working. lol

Originally I bought this s3 in HONG KONG, the baseband version that I flashed 4.3 is from Kazakhstan.. So I went over to http://ift.tt/R1nJKu and found that TGY (Hong Kong) has 3 firmwares: I9300ZSUBNB1- 4.3- 26.02.2014 and I9300ZSEMK3- 4.1.2- 06.11.2013 and I9300ZSEMC1- 4.1.2- 11.03.2013

Question: Which one do I use? and what would be the steps in fixing this problem?

Heres my info:
IMEIs match on BOTH in status of phone and on the back of the phone
Im currently on 4.3 Android Version
Current Baseband version: I9300xxugna8 [Kazakhstan]
Cell phone carrier: Mobilicity (Which is owned by Rogers)

Thanks for all the patience and help in advance.

Cheers.

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