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Hmm, apparently it doesn't stop it from downloading the update. However it definitely won't let the update install. I'm not yet sure which application is responsible for updates.
IMPORTANT Information Regarding .621 System Update - RootzWiki
suggests in video on the first post to prevent automatic updates do the following:
- rename BlurUpdater_VZW.apk to BlurUpdater_VZW.bak,
- remove BlurUpdater_VZW.odex and
- clean cache after.
Though instructions are for Droid X, but seems it corresponds with advices on this page.