Well, there's a Reset button/hole on the PE next to the USB port. On the other hand, maybe you just need to wait another minute.
If that's not the case and pushing the Reset (with a straight paperclip) doesn't help, there's a factory reset in Dingo which I think
is in Settings/eDGe something-or-other. (I can't go look because I now have Ermine!
) But as I'm sure you've read by now, many people have had to try multiple times to get their Ermine update.