I flashed my new 5500 back to the Sharp ROM this morning and installed a few apps (the Hancom stuff and Terminal). I put the Z in my pocket and went to lunch. When I got back, I pulled it out and turned it on, and it started booting up. I thought that was odd, since I didn't turn it off.
Once it was done booting, it was just like the first time I flashed it -- none of the new apps were there, and the sound setting changes I'd made were undone.
It's possible that a button or two got pressed in my pocket, but surely there's not a button combination that reverts back to the stock ROM setup? What might have happened?
Been thinking about this -- is it possible that the Z re-flashed itself? The CF card with the ospack was still in the slot when this happened. I've since deleted the ospack.