WOOHOO Thank you HTC!

[BigDinCA]

You're going to have to wait for someone over at XDA or a site like it to unlock it if you want to be assured it's going to work.

There is no site like XDA. That place is a one-of-a-kind magical candyland.

 

[sprinttouch666]

There is no site like XDA. That place is a one-of-a-kind magical candyland.

You my friend took the, oddly specific, words right out of my mouth lol

 

[Charles Lambton]

Actually, XDA has the exact same unlock guide.

[Tutorial] Root, Unlock, Recovery and flashing a Custom ROM - xda-developers

 

[Suda]

Actually, XDA has the exact same unlock guide.

[Tutorial] Root, Unlock, Recovery and flashing a Custom ROM - xda-developers

Read through the thread, I still wouldn't trust it. Files are missing/broken, other files are posted by other users to fix whatever's wrong with the OP instructions, and the success rate is low.

If you just to want to try one out though then I'd try this one over that:

[TOOL] HTC One (M7) All-In-One Toolkit V1.1 [4-5-2013] [PERM ROOT][Noob-Proof] - xda-developers

Here's one that was updated 5 days ago. I know he does good work and he's unlocked the One X, X+, Droid DNA, Vivid, and others. He doesn't know if it'll work for AT&T though. You brick it or get caught in a bootloop because you don't want to wait then that's on you.

 

[Aquila]

Every device can be unlocked... we just might not know how yet.