can i get the stock rom for my at&t g3 lollipop 5.0.2

hi everyone.

im here to ask you about my g3.
i installed cyanide-5.1.1-RC-18.0-d850 rom.
and i wanna back to stock rom because is a bad custom i didn't like it at all.
so please any one can help me to back to the stock rom for my at&t lg g3 d850.

please guys i need more than anything else.