Rooting problem of unlocked AT&T Optimus G Pro?

[kvraobsnl]

Hi, Namaste to all of you.

I am using an Unlocked AT&T OGP in India since 6 months. When I am trying to update software, I am getting the notification as "Your phone is not registered yet." The device is in 4.1.2
Hence, I tried to root it. But, I am unble to root it. I tried thru xda-developers guidence.
I want to change the os to cyonogenmod. But this is also not affected. Pl guide me. How to root it? How to cyanogenmod it?

 

[dkr627]

use kingo android root simple