In order to return our Galaxy S4 Active to stock unmodified software, we need a factory firmware that compatible with Odin. This firmware commonly consists of Android OS, radio, bootloader, kernel, etc., which required by our smartphones to work. Someday, when you got a very frustrating issue on your phone then an official firmware can be a life saver because you can reconfigure the phone’s settings and rewrite all the previous files with the new one, so hopefully our device will be able to work nicely as when you first buy it from the store.
The most recent firmware has been bundled with Android 4.2.2 (Jelly Bean), just like the software that you’re running now. It is advisable to download it over WiFi since the file size of the firmware is quite large around 1.4GB. Before downloading a firmware, make sure to find out your device model, since each file is uniquely made for each device model and carrier. Which means you can’t utilize the AT&T variant firmware to an International device. Forcing it, might make your phone bricked.
As we know, Samsung Galaxy S4 Active is available exclusively in the U.S. with AT&T (SGH-i537) while the non U.S. or International device has GT-I9295 model number. Before picking a firmware to flash make sure you find out the device’s region and carrier, this is very important especially for those who buy a phone with a contract. For the device with model number GT-I9295 you can download here, and for the SGH-i537 owner, you can use a leaked firmware that can be obtained on rootzwiki, the firmware has been packed with Odin (One-click) so you simply just run it.