Unhappy [Q] Flashing D80X TOT using LG FlashTool

Hi! I have an LS980 and I want to use it with AT&T... Ive read during my research some people complaining about their sprint lg g2 being 'stuck' on D80x that they flashed wronglly trough LG Flashtool -- and I was wondering.. if I flash the tot file for D800 or D802 will I be turning my phone into ATT Variant? Or is this too easy to be true?
Phone: i337M Modem: MK6 ROM: Best ROM ever

Tablet: Nexus 7 (2012) ROM: Stock (rooted with Nexus Tool Kit)