Bricked CMC-FD?

I have four CMC-FD’s. I just upgraded the firmware on all of them. I’m absolutely positive that I followed the instructions. The upgrade went fine for three of them, but one of them appears to be bricked. It doesn’t show up in the “safely remove hardware” dialog, and when I try to run the CMC Firmware Updater it says “Error: CMC is not detected”.

How do I fix this?

Update: I contacted the store and they gave me a replacement, no questions asked.