TWRP 3.0.3 from M.A.D. Team.
Tested on V17 Rom and also works with oldest roms.
First of all download supersu.zip and put in the internal memory
Flash TWRP using Flashtool with provided scatter file (you need to have installed Preloader/Vcom mediatek drivers before using flashtool)
Enter in TWRP with VOL+ and Power at boot, select Recovery with vol+ end confirm with VOL-
Allow TWRP to write in the system and immediately Install ZIP of Supersu searching it in the internal memory.
Credits to MAD Team for the TWRP
Their works: https://www.facebook.com/MediatekAndroidDevelopers/