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Check if you drivers have been installed correctly. Open your device manager and see if your board is recognized in the Ports (COM & LPT) or under Unknown devices.
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Check your cables make sure it is data capable and not a charging-only USB cable. To ensure your USB is not defective test your cable on another device.
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Don't use a USB 3.0 port on your computer, make sure that the port is 2.0