Upgrade my unlocked AT&T Note 2 SGH i317

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http://androidforums.com – My AT&T Samsung Note 2 (SGH-i317) has been downgraded and unlocked and is finally working on my new carrier (Movistar) thanks to your forum article (http://androidforums.com/t-galaxy-note-2-all-things-root/711598-need-hel...). However it still wants to automatically "upgrade" using the AT&T software. Is there any danger of the phone becoming locked again because of the AT&T upgrade? I don't want to have to repeat the whole downgrade thing all over again. If so, is there away to avoid these automatic download/upgrades without turning of my wifi (General)