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I'm not sure if you can do a Restore to Factory without the menu. I will say that holding the power switch for a ridiculous amount of time (like 45 seconds plus) on my K2 has resulted in a prompt asking if I wanted to restore to factory defaults... but I don't know if that will work for other models/machines.
I wouldn't think editing metadata in calibre would cause that kind of drastic issue, but if the ebook was corrupt before that... who knows?
Just know if you do get it to do a factory reset, you're going to have to re-register the Kindle—but it's not like you can really use as is, huh?
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