Help With My Clone

i tried my best to search around but its hard with clones
i was wondering how i go about rooting and installing a custom firmware on my Galaxy Note 4 clone
right now it has a crappy china FW on it and it blows me up with ads and such.
i dont know much about the phone itself but i will try my best to give as much detail as Possible

Galaxy Note 4 clone
model: SM-N910U
android: 4.4.4
Baseband: N910UXXU1ANIF
Kernel: 3.10.9-2816635 dpi@SWDD5006#1 Thu Sep 18 20:25:07 KST 2014
Build: KTU84P.N910UXXU1ANIF

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