How to UNroot my Samsung Galaxy Note 4 SM-N910G Phablet

I have rooted my phone using KingRoot, now I cannot brick it.
I've tried everything, but nothing has worked...

Samsung Galaxy Note 4 SM-N910G Phablet
Android OS 5.1.1 Lollipop_MR1
GPU: Adreno (TM) 420
OpenGL ES-CM 1.1 [arm based]

Please, I need help, Thankyou.

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