Sometimes I should just leave well enough alone

I went to register my AvMap EKP-IV GPS. While doing so, I noticed that the firmware I have is a couple of version numbers older than the current downloadable one. Upgrading is supposed to be a simple matter of popping out the CF card, putting it into the computer, and copying over the two files you download, and then putting the CF card back in the GPS. Well, I did that, but then the GPS started saying “Device not found”. So I copied back the original files, which I’d copied onto my laptop as suggested in the documentation. And I got the same damn message. So now I’m basically boned.

The instructions were all about “Hilight the two files and drag them”, but I used “cp -R”. I wonder if there is a permissions problem? I knew I should have made a tar file instead of just a copy.