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If you already see the COM port, you can ignore this step.

You may be missing the drivers, which can be downloaded from https://reprap.org/wiki/RUMBA#RUMBA_USB_... . The recomended method is the Easy driver setup for Windows 8/7/Vista/XP 32 and 64 bit

After driver installation if you still don't see the COM port, try rebooting your PC.

Suddenly disconnecting power while your PC is talking to your robot scares Windows. It will hide the COM port until after a reboot as a precaution.

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