1. Download and Install the latest version of AutoRoot_tools.apk (Link below).
2. Run AutoRoot_tools.apk on your PHONE. Wait few seconds for AutoRoot Tools to recognise your device and version number.
3. Select the available Android OS version OR Custom ROM you wish to install from the dropdown box.
4. Click the Start button, and wait for the process to complete.
5. Once completed, you will have your selected firmware version or Custom Rom installed on your device.
That is all about How…