By default, Samsung Galaxy S6 is set for automatic FIRMWARE updates for software, but it updates only when you have the wifi connection, it will not update from your mobile data connection. So if you want to disable software updates from Samsung Galaxy S6 then it is very simple steps to enable disable Firmware or Software Updates in Samsung Galaxy S6 Edge.You can also do it by going to
Steps to Stop Firmware Update in Samsung S6
Home Screen > Menu > Settings >About device > Software Update Look for the “Automatic update” Option.
If it’s ON then turn it “Off” and your Samsung Galaxy S6 is no longer check for automatic updates or Check for new Android firmware updates.