10C not recognized by Sena Manager for firmware update - Mac

Sena Device Manager 4.0.5 will not recognize my 10C for the latest firmware update.  2017 iMac 5k on 10.15.7. 

I've updated my firmware successfully up to this point so I understand the procedure on how to upgrade. 

Is this the USB 2 vs USB 3 issue that others have posted about?  I don't have an older Mac anymore and don't have access to USB 2 ports.  How is the software not able to recognize USB 3 ports if this is the problem?


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