[Q] screen mirroring not working (rooted SM-N900), screen mirroring to bluray BH-600 topic

Hi all,

i just bought a bluray BH-600 for screen mirroring purpose only, yeah.. because my TV isn't smart TV... lol
In short, my screen mirroring didn't work. Actually I want to unroot my device, but I can't find stock firmware for SM-N900 at sammobile.com.
in risk reason, i looking for another way to do that, maybe with a fixing patch.. I went already to :
http://forum.xda-developers.com/show....php?t=2621550
but there is not for SM-N900.

any suggestion for me, please guide me step by step, because i'm a beginner.