Two updates are pushing to get everyone on build MK2
AT&T and Samsung have reissued the Android 4.3 update for the Galaxy S4, and according to AT&T it should start pushing out to devices today. The update seems identical to the last round, which was pulled for unknown reasons by Samsung shortly after things got started. We imagine there are important changes under the hood, though.
Anyhoo, if you're not yet on Android 4.3 your update will be a wifi-only 727MB download, and when all is said and done your device will be current as far as things stand now. If you had previously installed the 4.3 OTA, your update will be a small 28MB update. In either case, you'll be running version I337UCUEMK2.
Got that? Don't fret if you're not up on all these numbers and versions. Just wander into the forums, where you can get all the help you need from people just like yourself. OTA days make the forums especially love-filled, so don't miss all the good feelings and karma.
And enjoy your update and your turkey.
Source: AT&T. Thanks, Michael!