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The device cannot be accessed even though the deviceID is supported in FTDIUSBSerialDriver
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An ownership or permissions problem is preventing the system from making the device accessible.

Check that the driver is owned by root and wheel. The most common symptom is the group for FTDIUSBSerialDriver
is not wheel. To change the group, login as root and perform the following script in a Terminal window (Go > Applications > Utilities > Terminal):

   cd /system/library/extensions
   chgrp -R wheel FTDIUSBSerialDriver.kext

Reboot for the change to take effect.