Today another shock to Samsung, one of their Android 4.4 kitkat firmware has been leaked on XDA developer website. This firmware has been leaked for Samsung Galaxy S4 AT&T variant and it is released by designgears. It is not a latest KitKat firmware because it has a build date of 2nd January and its build number is I337UCUFMLD. A latest version of KitKat firmware was also leaked for the international version of Galaxy S4 earlier this month. But according to Sammobile.com Samsung let their users to try Android KitKat 4.4 on Samsung devices before they officially release it. So Samsung is not worried about this firmware leak.
Now before you flash leaked Android KitKat 4.4 firmware on your device there are one or two things you should have to know. First of all you all should know you may not able come back to your official 4.3 firmware after you flash 4.4 because of its new bootloader. You will also need a root hack for rooting your device, Its not possible until someone comes up with that hack. A very big issue in this firmware is that when you will try to play a video your device will automatically reboot.
If you still want to this firmware on your device here is the link. Source