That majorly sucks. Every time I flash I worry about perma-bricking. These devices are mysterious, I had a N810 w/ unresponsive touchscreen suddenly work and then upon reboot quit functioning.
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Documentation is sparse, it was mentioned in a couple places in the wiki, but that seems to be GONE. Way to go people deleting valuable information from there for the sake of making it N900 n00b friendly >.>

This thread http://talk.maemo.org/showthread.php?t=15712&page=2 has some interesting information. Essentially you'd have to go through a process of assembling an appropriate cable - unfortunately it was not completed and there are no success stories that I am aware of -_-