my galaxy s6 SMG920W8 is stucked at samsung logo how to fix?

[AC Question]

firstly i rooted my phone then i was trying to get rid of the root or unroot my device then one day i restarted my phone so this happened and its not passing the samsung logo...,,,,even though i tryed flashing my phone but i did'nt get the suitable firmware file for it, its "SMG920W8" "CANADIAN" but the problem is that i can't find what file to download, of course i already downloaded "odin" and "samsung drivers"..so plz help me out am losing hope........................