I upgraded the PC software and downloaded the latest beta player file. (13) When running the upgrade wizard my unit is never found. I tried changing from com1 to com2 and the wizard immediately screamed there was no unit found on that port. I'm using the cable that came with the unit so I'm asssuming it's really a null modem cable. I've tried leaving the power on before beginning and leaving it off and plugging the cored in when prompted; no difference. No other process is using the serial port. Any suggestions gratefully received.