How to root Finow X5 air properly

Hello,

Kindly describe how to root Finow X5 AIR, using TWRP and SuperSU. What is described in the froums are not working. SuperSU is installed properly, but when Titanium back up and Romtoolbox, is opened, it shows that proper root is not obtained, So I don’t know that what is happening. Kindly help me.

Thanking You
drsaidalavi