Tecno W3 is one of Tecno’s latest phones. This phone runs on Android 6 (Marshmallow), making it not fully supported by rooting apks at the moment. This brief guide will explain how to flash TWRP and root the Tecno W3. You can view the Specs of the Tecno W3 at https://www.hovatek.com/forum/thread-14007.html
Boot the phone into recovery mode using Volume up button + Power button
In TWRP, if you get a prompt asking you to swipe to allow TWRP modify the system partition then go ahead and swipe. To swipe, place your finger on the green circle then slide it to the right
In TWRP recovery, tap Install
Navigate to the location of the SuperSU.zip and select it
Swipe to confirm flashing of SuperSU.zip and wait till flashing is complete