Default Samsung Kies: gt-i9300 does not support initialising

Hi There,

I am trying to update my Samsung Galaxy S3 firmware from Kies 2 but i get the following error;

Code:
'GT-I9300' does not support initialising
I bought the phone to Three network from Ireland, and it is locked to this network. Is it possible that they do not allow firmware updates? If yes can I change it? How?

There are two images, one where you can see that there is no firmware info and other with the error.

I don't know what the following information means but it might help. After using the code *#1234# in the dialer i can see this:

Code:
AP: I9300XXELLA
CP: I9300NELK2
CSC: I93003IEELL1
Thank you very much for the help.
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