Download iRoot v.1.8.0 from here, here or here. Download, install and launch the application, it will upgrade itself to version 1.8.1. (from 150203).
Download previous iRoot v.188.8.131.52 from here.
iRoot, formerly known as Vroot, is a free one click Android root tool. Just click one button, you can root your Android device immediately!
iRoot is an easy-to-use tool. Enable the USB debugging mode, and connect your phone to the computer, then click the button “root” and now what you have to do is just waiting for the root result. Forget the complex and troublesome tutorials, everyone can control it easily.
iRoot’s goal is providing the excellent and simplest experience for all android users. The newest version of iRoot has supported more than 8000 Android devices. It is more effective, easier and faster than you can imagine.