So I have a htc one m7 att unlocked phone. ? Is do I download the firmware for att even tho am using metro? Or do I update using the t-mobile metro firmware? Htc told me to download the att one. But wouldn't tell me why. I don't care about the att apps. any ideas? thanks I can't update with the phone. since its not hooked up with att anymore. I have to download the file and use my computer.