Quote Originally Posted by Lincoln96 View Post
Happy to report that I was able to fix the card reader.

Even happier to report that the project I could never load (Eagle Clock) has now been uploaded successfully! What did I learn? It seems that reformatting and downloading new firmware must be done without a project open in the program. Otherwise the firmware gets corrupted somehow. Does that make any sense at all?

And because I haven't been kicked in the groin enough yet today, I put the original "bad" card back in the reader, with the program running, and no project open, formatted, loaded new firmware, and now that card is working too.
Sounds like success is happening! An extra card is handy. You can be designing and up loading while the machine is carving away.