For those among us who just can’t want any longer for an official rollout of Kit Kat to the Galaxy S4 or Galaxy Note 3 on AT&T, firmware has been leaked through XDA that will allow you to run Android 4.4.2 on your device before it is shipped out to the general public. And while flashing unreleased firmware can sometimes be dangerous for your device, the feedback so far on the forum is all good except for one random reboot bug for the GS4 which appears when watching videos. Besides that, both firmware packages seem quite stable.
On top of the one bug specifically for the GS4, both firmware comes with new bootloaders, so attempting to flash back to Android 4.3 firmware might prove difficult, unless you know exactly (and I mean exactly) what you are doing. In addition, the firmware for both is unrooted, so you may be better off waiting until the developers have more time to work on it and add that in. Again, if you can’t bear to wait for AT&T to push Android 4.4.2 to your device, this is a valid option.
Kit Kat, thanks to TouchWiz, doesn’t bring as many changes as one would hope for Samsung devices. While the UI gets a little tweaked and Samsung added in a bit more of their own software, you won’t see any major differences besides the icon color in the notification bar. We are still waiting for a major UI overhaul like we have seen in leaked pictures recently.
If you are ready to get your flashing on, head on over to XDA by following the link below.
Via: XDA Developers  | SamMobile 
Some of our best videos.