To root your Android phone especially tecno with IRoot go to mgyun.

1. Download IRoot from the site by scrolling down and clicking on the Download link or click here for vroot latest version or download latest version of kingroot here Kingroot 4.1 or go to this Link
2. After downloading,click on ROOT icon, and wait for it to root after that you will reboot your phone and see kinguser as your superuser . sometime, you don't need to reboot your phone 
3. To root phone like Samsung s5, download towel root from Here or here. Then click on ROOT