![]() It is possible to force the COM port to remain with the same number if that is what is required. Of course, the COM port number will be reflected on Arduino IDE but this is not a problem to upload sketches and the board will function as usual. Therefore, the same device on the same port can have different COM port numbers depending on the its functioning mode or the USB port it is connected to. ![]() Also, a new COM port will be enabled if the device is connected to a different physical USB port. Windows enumerates a new different COM port for every serial number or VID/PID detected. For example, on bootloader mode the serial number presented to Windows' Device Manager is different to the serial number of the board when it is on application mode. The serial number of an Arduino board differs depending to the mode the board is functioning on.
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