The usual thing to try is to reset the unit. If your model does not have a dedicated reset hole, then hold the power button 10-15 seconds till you hear the drum roll sound and try connecting to the computer then.
The only way to update a TomTom is via their Home application which is available for Windoze and MAC, sadly they don't offer a version for Linux so unless you own a Windoze or MAC platform updates are out of the question - Mike
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