Android 4.4.2 comes early to the Galaxy S4 (GT-I9505) in the form of an unofficial test firmware.
The folks over at SamMobile have managed to get their hands on the latest test firmware for the Galaxy S4. Samsung is officially set to roll out Android 4.4 KitKat to the Galaxy S4 sometime in February or March, but if you’re eager to try out Android 4.4 KitKat on your Galaxy S4 now, download the firmware from the link below and flash it using a utility like Odin. Do note that installing this build would erase all data on your device, including the data on your SD card.
Installing this firmware will not count towards your binary counter, but this isn’t an official build by Samsung. Instead, it is an internal test firmware is used by Samsung. As such, there are bound to be a few bugs and the occasional crash, but all the features that would be available on the final version should be included on this test build.
The build number for this firmware is I9505XXUFNA1, and it is designed for the Qualcomm Snapdragon 600 version of the Galaxy S4 (GT-I9505), and not the international version that comes with Samsung’s Exynos 5410.
Download: I9505XXUFNA1_I9505OXAFNA1_I9505XXUFNA1_OXA.zip (Downloading the file requires a free account)