[Elecraft] KPA500 firmware load fails?

[David F. Reed]

My K3 is wired to my KPA500 and KAT500 per the instructions and works 
fine with one exception...

I cannot talk to the KPA500 using the utility (version 1.12.3.12) on 
COM8 (same port as the K3), but its not "seeing" the KPA500...

Is there something I am missing, like turning off the K3, or connecting 
only to the KPA500 to do this, or???

Thanks & 73 de Dave, W5SV