Android version: 5.1.1
Compiled on: 06/13/2015
Bugs Fixed: sensor and hotspot
It has a builtin ROOT, so no need to install any 3rd party ROOT.
Just go to About Phone and keep on clicking Build Number until it shows a message that Dev setting enabled. Go back, and click on Dev Options, scroll down to Root Access and select APPS and ADB. Done! your phone is now rooted.