the link in the post above is STALE. Here is where I found it:

http://h10025.www1.hp.com/ewfrf/wc/s...item=ob-9854-1

Also, if my link is stale, go to hp and search for, ZT1135, NOT YOUR MODEL NUMBER. the patch applies to zt1xxx. I have a zt1235 and the bios update isn't listed for my system. So you should search your system first, then try searching zt1135.

-ben