How to update LG G3 d850 without being on the at&t Network?

[AC Question]

Hello, i need help on updating my LG G3 D850 to android lollipop as i am using an unlocked phone and is not in the US. So can someone guide me on getting the offical 5.0 update on my phone. I dont want to install a custom ROM.
Thank You.

 

[sanjeev aher]

Same here please help !!