In , right-click the Prolific entry and select Update Driver .
icon (or Radio > Download) with the radio OFF, then power it on when the software starts the transfer. Common Issues Software to program Vertex VX-351 PMR? : r/amateurradio vertex vx351 programming software work
You must manually "Roll Back" the driver to an older version (usually version 3.2.0.0 from 2007). In , right-click the Prolific entry and select Update Driver