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I hope this approach restores operation to your Garmin Zumo:
Try ownloading, installing, and using Garmin Express.
and (if you have a Windows PC) click on the big blue Download button at center bottom of the page.
(If you have an Apple, click on the nearby Download for Mac link.) 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.
- if that doesn't help, let me know how the Zumo reacted to that approach, and how old it is (measured from purchase date) and I will advise you further.
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