You using a custom 4.0.4 ROM, or is AT&T just being stingy with the update and rolling it out gradually to users?

 

No custom rom. Its an AT&T update. It came out on Aug 2. I kept checking to get the update OTA and I never got it. I also noticed other One X users weren't getting it either on Android Central.

Here's the thread about it: http://forums.androidcentral.com/htc-one-x/202139-still-waiting-4-0-4-update.html

I had to do a factory reset to get the update. Look into it and call AT&T before you do that because some users still didn't get the update after doing a factory reset. Hopefully future updates won't be like this, especially when jelly bean comes out.