AT&T wireless is now rolling out android marshmallow update to its exclusive smartphone Samsung Galaxy S6 Active. The software update is now live in USA and also available to download. The s6 active users will get this marshmallow update through FOTA. In this latest firmware the android os version and build number will be updated to android 6.0.1 and MMB29K.G890AUCU3CPE4. It will also enable WiFi calling feature for this handset.
The download file comes in large size 1441MB (1.4GB). To download this big update you need wifi connection. Before upgrading the device marshmallow os, backup your files to removable storage devices. If you already have backup then check for software update by Settings > System > About Device > Software Update > Check for updates. If you got the notification follow the installation procedures that displayed on your screen.