I created a step-by-step guide video to unroot/unbrick the Galaxy S6!
Grab all the files and other needed information here: http://www.androidrootz.com/2015/05/how-to-unroot-galaxy-s6-and-s6-edge.html
Grab all the files and other needed information here: http://www.androidrootz.com/2015/05/how-to-unroot-galaxy-s6-and-s6-edge.html