Do you happen to have an SD card installed in the Nuvi? I've only seen this error once before and when the SD card was removed from the device, the user was able to connect to myDashboard.
I also found this explanation of the error, although I have no knowledge of the repair tool available and don't recommend you use it until you understand more about the issue and whether it's your PC or the Nuvi that is causing the problem:
Joined: 02 Jun 2011 Posts: 12 Location: Seattle, WA
Wed Jun 20, 2012 10:44 am
Try this (worked for my 3595):
Unplug unit from computer.
Power up unit and get to main screen.
Press the Volume icon.
On the volume control screen, press and hold the upper-right corner of screen for ten seconds (there's no icon there, just press and hold the upper right corner).
A "Diagnostics" page will appear.
Scroll down and choose "MTP Settings"
It will likely say "MTP Auto Detect". You want to change that "Mass Storage", then press save.
IT WORKED! Pulled the SD card and went right to it. Used this on both the 3590 and the 2555. Looked at the other suggestion for MTP settings and noticed both nuvi's were in auto detect, should I change to mass storage?
Another suggestion was not compatible with my windows 7.
Garmin just informed me that they have posted for download an update for the Garmin Communicator plug in.
Maybe it will work, no way of telling on my units. I think they changed the way it looks at memory cards (over 8Gig.)
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