Can't root Vodafone Smart Ultra 6

Hey guys, tried to root my Smart Ultra 6 which was on Android 5.1.1 and nothing would work. Tried KingRoot, iRoot, KingoRoot, to name a few. Then I installed an older version of Android, 5.0.2 and still no luck. I'm not very experienced or knowledgeable when it comes to rooting so does anyone have any idea of what I could try?

Thanks, Kabuki

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