Thanks to all who offered advice. This morning I removed the KXPA100 from the loop. The KX3 utility was then able to download and install the latest firmware. Of course this leaves the question about what is going on with the KXPA100. I will troubleshoot that as I have time. But for now, I know the KX3 and the FTDI-USB cable are good. 73, Dave, K4TO