Okay, I haven't gotten any response here:
http://forum.chumby.com/viewtopic.php?id=8137

And, well, the chumby that won't run the cron jobs has had other problems for a long while.  I think it dates back to a power outage or something while doing an update a while ago.

How do I completely wipe the little sucker and restore it to original?  (I'll use the zurk firmware again as soon as I do, but hey.)

I've tried the "reboot while holding down the screen" but there's a lot that's retained; it still knows, for example, the passwords that I set for ssh.  I suspect the problematic bits may be retained as well.  Can I

rm -rf /

and start over somehow?  What do I need to use?

Thanks!