Materials Needed For Rooting
» PC with internet connection
» USB Cable
» SP Flash Tool - Download it Here
» SuperSU.zip - Download it Here
» TWRP for Tecno W4 - Download it Here
To Root Tecno W4
» Save the SuperSU.zip that you downloaded to your phone's SD card
» Unzip the TWRP zip file that you downloaded and flash the recovery image to the phone using SP Flash Tool
» Now, boot your phone into TWRP Recovery Mode (by Holding the Vol Up and Power button simultaneously for 5 seconds)
» In TWRP Recovery, Choose install zip from SD card - to choose a zip from SD card use Vol up and down scroll up and down, then choose the Supersu.zip file from the root of your SD card.
Scroll to yes and install, after a successful flashing go back and reboot.