Latest Samsung Galaxy S6 Active (SM-G890A) - ATT firmware
Samsung Galaxy S6 Active (SM-G890A) firmware for USA (AT&T) (ATT): 1 build in the SamMobile archive, newest first. The latest is G890AUCS7DRF2 (Android 7.0, built 14 June 2018). Open a build to download it, or switch region with the country selector.