Lenovo k3 note android 6- twrp custom recovery

hi ive just updated my lenovo k3 note to android 6 , now i wanna root it , but i dont have the suitable recovery fo that ive tried installing old recovery that was for the previous android i think and i bricked my phone but i recovered my phone and now its having new update android 6 please help me about the custom recovery fo that so i can root my phone