I had the same problem, using a Samsung Galaxy J-3 with the TracFone service as my carrier. Apparently, it's the problem can be solved by blocking push notifications from Samsung updates or anything that looks similar to Samsung updates, Indy system preferences under notifications. Even if you have the notification message on your screen and cannot get rid of it in order to reject the update, if you first block all notifications from Samsung, and then reboot your phone, apparently that notification message goes away, and the update does not install. So far, this is the solution for me but, knock on wood, tomorrow something new could develop, I suppose.