Help to root tablet Insignia Flex 10.1 (ns-p16at10) with Lollipop 5

Hey guys, I don't know if this is the proper forum to post this but unlike other devices, this one is not listed in your forums.

Anyway, 1 week ago I bought the Insignia Flex 10.1 tablet (came with Android 5.0) and I'm not able to find any information on how to root it.

I have tried Kingo Root from PC and from Android directly with no success.

Does any one manage to root the tablet?

Can you help me?

Thank you very much in advance.