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Join Date: Oct 2008
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Yes you must be on an at&t network to receive over the air updates.
Unfortunately kies only works for versions ending with mi9. Probably because sammobile.com only released mi9.
The easiest way to update is to borrow a friends at&t sim card and update. It might be possible for a Samsung rep at your local bestbuy to update you.
However since your on jellybean rom it's possible for you to gain root access and install a custom kit Kat rom. Check out the development section on here if you want to go that route.