Another thought:
Maybe your Zumo has a problem with the mass storage modus. Garmin does not implement it to all devices by default!
You can check this by plugging off the cable from the Mac and turning off your Zumo.
Then you restart your Mac and you connect your Zumo to Mac. If your Zumo starts then, mass storage should work on it. Which is necessary for the computer to recognize your device. To test this case with a USB 2.0 hub it will be better to use an actice hub to avoid a power problem!
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