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;

'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:

CP: I9300NELK2
Thank you very much for the help.
Attached Thumbnails
Click image for larger version

Name:	kies01.png
Views:	4150
Size:	47.4 KB
ID:	2473922   Click image for larger version

Name:	kies02.png
Views:	1984
Size:	9.4 KB
ID:	2473923