How do I uninstall the VCP driver on a Mac OS machine?
To uninstall the VCP driver from a Mac OS machine, just drag the driver to the trash from the System/Library/Extensions folder (SilabsUSBDriver) and then reboot the machine.
To verify if a driver is present, plug in a CP210x device and check the /dev directory for a device named 'tty.SLAB_USBtoUART'. If this is not present, it means no VCP driver is active, or that the CP210x device has a VID/PID combination that does not match the driver installed. The VID/PID can be found in the device listing in the System Profiler (even if a corresponding driver is not installed).