I have a Garmin Nuvi 3490 GPS that works perfectly, but I want to update the map. When I plug it into my laptop's USB ports using the Garmin cable, however, I get into the "mass storage" mode, but also receive a message from Windows 10 the the USB device is unrecognized. I have reset the device several times, and tried a similar cable without success. I am reluctant to reset the device to "factory" standards for fear that I'd lose the map data that's already in it. The battery is charged. I have downloaded and installed Garmin USB drivers, and I have the latest version of Garmin Express. I also tried to use Garmin "Updater" without success. When I plug the device into a USB port, the laptop chimes, and I can find the Nuvi under the printers and devices menu, just not under "My PC." My online searches have revealed no solution.