I think you need to follow the steps relating to the "bot of !" because otherwise you can't install the custom recovery. Read some of the more recent comments in this thread to see what others have done to resolve this issue--I never faced this problem, so I'm not an expert in resolving it. I'm just trying to keep this guide as up-to-date as I can.
It's hard to brick your Xoom. Just go slow, be prepared and you'll do fine. Plus, there's a lot of people that will help you if you do get stuck.
Transformer Infinity 32Gb - KK 4.2.2
ROM: CROMBI.KK with _that kernel
Nexus 7 32Gb - KK 4.4.2
Galaxy Note 2 - 4.3
--helps you, give them a THANKS!