Default [Q] Note 3 AT&T - SIM UNLOCK?

I currently have my 4.3 note 3 region unlocked and using it on straght talk successfully using the software region unlock app by chain fire.

However, I would like to upgrade the phone to Kit Kat and have the region unlock remain. What are my options as far as software sim unlocking my kit kat note 3 on at&t, is it at all possible? I would imagine the region unlock from chainfire isn't permanent and would disapear after upgrading