As far as I know, Microsoft has not actually used the Update feature on phones, so I don't think you are missing anything.
Also, this section is for a very different model than the AT&T Tilt. Your phone is actually called the "Kaiser." The Kaiser section on this forum is pretty dead, but you may have more luck asking here on another forum:
http://forum.xda-developers.com/forumdisplay.php?f=377