Maybe you do not realize that Android 4.4.2 KitKat that running on your US Cellular Samsung Galaxy S5 is a part of the stock firmware. The firmware is the software that controls how your smartphone work, without it your device will not be able to do anything. The stock firmware was stored in the system partition, we can replace it with other official firmware using tools like Odin or Heimdall, some people even take advantage of a stock firmware to recover their bricked phone.
If you rooted and then applying several mods, then we highly recommend you to own at least one US Cellular Galaxy S5 stock firmware for now. You might confuse, why I should have it now, while my phone is okay now. Well, we do not know when will get a problem, another reason is the firmware file size is quite large, almost 2GB, so it will save you time if you have it now.
US Cellular Galaxy S5 (SM-G900R4) stock firmware collection
The USC Galaxy S5 was released along with other U.S. carriers in April 2014, and we already know that S5 has been distributed around the globe, each and every S5 has an identical hardware spec according to the region where this device is marketed. The US Cellular variants has SM-G900R4 model number, and it’s for sale in the U.S. only.
|1||SM-G900R4||US Cellular||G900R4VXU1ANCF||4.4.2 (KitKat)||March, 2014|
Prior to download, verify your phone model number, also don’t forget to get the same software version as a lower version of stock firmware would not be suitable for your device, force to flash it could lead to soft bricked. To see all the information you can check out Settings -> About.