/ HTC

This is how I debranded and rooted my AT&T HTC One A9

I'll be logging here the XDA forum threads that i've followed in trying to root and debrand my phone.

DISCLAIMER: YOU MAY FOLLOW THESE STEPS AT YOUR OWN RISK. I AM IN NO WAY RESPONSIBLE FOR ANY MISHAPS OR ANYTHING THAT MAY CAUSE YOUR DEVICE TO BREAK OR LOSE DATA!

First step: Unlock bootloader from HTC
http://www.htcdev.com/bootloader

Second step: Convert the device into a dev device (s-off, writecid) You'll need $25
http://forum.xda-developers.com/one-a9/development/s-off-convert-to-htc-usa-unlocked-1-12-t3271861

Third: Flash a better unlocked ROM
http://forum.xda-developers.com/one-a9/development/att-dev-rom-vvm-integrated-release-4-24-t3365326

aaaand i'm done!! I did it in less than 4 hours.