Apparently there was some issue related to user data being made public or something of that sort few years back. Since then Samsung has modded their policy by removing all user data once user submit their phone.About those akg earbuds.. it's really c...
I don't think samsung will be pushing any more Android updates for s6/s6edge/s6edge+/note5 series phones. These phones are discontinued now and have already received two major Android revisions.