Lucky my 'BRAND NEW' tablet is B01 but after update 3.1 how to root?

got the 'brand new' B01 from EBAY. And it feels super fast compare to my samsung even to my girlfriend ipad air. But I saw many post show i should root and turn off kill switch? But i didn't saw any method is able to root 5.1.1 for now! So anyone could show me how? Thanks!