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When dealing with an update for your Garmin device, or communication issues, it is best to simply download, install, and use Garmin Express.
and (if you have a Windows PC) click on the big blue Download button at center bottom of the page.
And download Garmin Express' installer to your computer, save it, then double-click upon it to install Garmin Express.
Then start the program, Garmin Express. Then connect your Garmin device. Then use Garmin Express to update your device, or to download data off it, etc.
If the problem is basically with the computer recognizing the Garmin device as present at all, that's different. It may be addressed by
- trying different USB ports on the computer
- trying a different USB cable
- trying (if the jack on the Garmin device might have dirt or dust in it) scrubbing the jack out for at least 20 seconds, with an old (but, dry, and clean!) toothbrush, then trying the connection again.
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