According to AT&T, its version of the LG G Flex will receive an update to Android 4.4.2 “Kit Kat” tomorrow.
The update includes a new full-screen mode (Immersive), restyled notification and navigation areas, battery performance improvements, and “enhanced” processing speed. You should also find some of the other goodies that came with Kit Kat, like cloud printing, Tap & Pay for making secure NFC payments, the ability to choose a default SMS app, emoji, and prettier music controls from the lock screen.
The update is 686MB in size, and can be grabbed by going into Settings>General>About phone>Software update>Update now.
Via: AT&T