A
Google searchCan I unroot my Samsung Galaxy Note 4
That\s for rooting. You asked "Can I unroot" - that means it's rooted and you want to remove all signs of rooting. To do that you reflash the stock ROM. (Back everything up first - the stock ROM doesn't have anything you added or changed since you got the phone - see Backing up an Android Device.)
Ah.. That's what I get for speed reading.Can I unroot my Samsung Galaxy Note 4