iRoot is one of the best android rooting app in the world, with over 90% success rate. The which covers over 150,000 devices of Android OS including notable brands like Samsung, Google, Sony, HTC, and others is the easiest android rooter that can unroot your device with just one click.
How to use iRoot on your device
Download and Install iRoot Apk on your device, open and click on Root then you are done.
Screen shot is iRoot v3.2.2
Click HERE to download iRoot v3.2.2 free