That's exactly what happened to me the first time I tried to do an upgrade. What ended up happening (I think) is that the serial port parameters got messed up during the switch. I ended up completely defaulting the system after the bank switch and then uploaded the database. I have never been successful doing an upgrade without having to completely default the system. I suppose it's probably better that way because the way they say it works in the manual sounds almost too good to be true.

Ed Vaughn, MBSWWYPBX