In addition, they would have to prepare the HD beforehand with the xbox dashboard and the hacked files so that the machine could load up unsigned code (I believe you won't be able to format/lock a new drive with evolution-x and configmagic with this hack, you would have to do that on a PC).
Somebody prove me wrong? I haven't really tried it myself, but from my experience, I don't think you can do it without a PC.