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2.Open “Device Manager”, and unfold Port (COM & LPT) to check the existing
port.
3. If there is a yellow warning triangle under 'Ports' or 'Other Devices', you
operating system has a previous driver that may cause incompatibility issues
4.Click the error device and click “Uninstall device” and you will need to update
the driver to the latest driver at:
bit.ly/driverfree