mcu 'mcu': Unable to connect

I purchased a back-up board as a safeguard. I had to manually install the firmware on my back-up board because it wasn't being detected during the configuration process. I would like to know why one board would be detected and not another? I would gladly pay RatRig to test these boards before sending them out. Also, I'm receiving the following error message on my back-up board:

Klipper reports: ERROR

mcu 'mcu': Unable to connect
Once the underlying issue is corrected, use the
"FIRMWARE_RESTART" command to reset the firmware, reload the
config, and restart the host software.
Error configuring printer
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