unable to connect to network on Samsung galaxy S3

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http://androidforums.com – Hi guys I'm hoping someone can help me. I have a Samsung galaxy s3 19300i and a month ago there was a software update and when I tried to update my phone would only get as far as the Samsung logo. I tried rebooting, clearing caches and eventually factory resetting and nothing worked. A friend of mine brought it back to life through Odin and I thought it was sorted only to realise after that I can't connect it to my network (Meteor in republic of Ireland) or any network for that matter. I would really appreciate it if someone can help, I am not technically minded at all. thanks (General)