Suddenly, the Device Manager refreshed. Under the "Ports" section, a new entry appeared: . He jumped back into Miracle Box, clicked the "Scan" or "Port" button, and for the first time that night, the dropdown menu populated with a COM port.

Open the dropdown menu and manually select the specific COM port assigned to the SU2Serial driver (e.g., COM4 ).

If your computer lacks the correct driver to recognize this specific interface, the device will show up as an "Unknown Device," or the software will try to use a port that doesn't exist, resulting in a connection failure.