What is the reason why the serial port of overtime machine can't be opened?

Because the serial ports don't match. Can be solved according to the following steps:

1. Right-click (My Computer), and then click Properties. Pop up the (System Properties) dialog box, select the hardware, and click (Device Management).

2. Select (port), find the USB port you installed, right-click the display (properties), click the display properties dialog box, and select (port setting) to set the COM port set in the dialog box as the serial port you need.

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