Latest Samsung Galaxy S5 Active (AT&T) (SM-G870A) - ATT firmware
Samsung Galaxy S5 Active (AT&T) (SM-G870A) firmware for USA (AT&T) (ATT): 1 build in the SamMobile archive, newest first. The latest is G870AUCU1ANE4 (Android 4.4.2, built 9 May 2014). Open a build to download it, or switch region with the country selector.