As in today's Kickstarter update: You must not disable firmware options in the system configuration utility without an appreciation of what the result will be, for example, if you disable xHCI, USB or Video Output, you will not be able to use a USB keyboard or view what is being displayed by the system. We added a warning message to the firmware update 1.02. Boards shipped after 21 April, have this firmware installed, and a forthcoming firmware update 1.03 will include a factory reset procedure for the board. I think that is a very welcome option...
And for those who ordered and received a pre-order the following update is also interesting: and @Laura would be nice to have this warning added to the documentation page as long it is not solved! Edit: added warning to doc page