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Nuvi 3597 update 4.20 keeps failing?

Former Member
Former Member
I have a Nuvi 3597 and am using Garmin Express to update map and software. Going through the process I keep getting "There was an error installing the update." In the step where I unplug the device from the computer, it seems to be restating and installing, then the screen goes black and the normal Garmin main menu comes up. Then, when I plug it back into the computer I get the error message in Garmin Express.

I've tried this three times and the same thing happens. Any ideas?