This is starting to bug me. I'm getting this same message on Kies. I did the last update fine using Kies but since then it says i9300 not suppoted for update. I've tried a fresh install and everything. To make matters worse my S3 is on Orange and has no OTA update options in tbe menus so how the f**k do I update to Jellybean without getting a custom rom which I don't want to do?