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I set COM2 for my USB serial port device and it appears as "COM2 serial port" in device management. Then I map the COM2 to serial port 2 in WM emulator configuration. But when I try to open COM2, it says COM2 doesnt exist. Then I use string[] allComs = System.IO.Ports.SerialPort.GetPortNames(); to check all the ports, find out COM2 is missing.

Any thoughts? Many thanks