Succeded, I was able to switch the driver from MTP to MSS, Now I can access everything (I think). Different Icon on the device display.
So WHat should I delete in .System, I see that there is a folder called "Map" and one called gpx, so I should remove the .img from "Map" and the content in the GPX-folder-
FYI, this is what I did:
Connected it, it showed up as an MTP-device.
Opened Device manager
opened "Portable Devices"
Selected the Garmin 61, right-klick
Selected Driver, Update driver.
In the dialog, I selected "Browse My computer for drivers"
Selected "Let me pick from a list......."
THere was the driver for MSS, selected it and OK'd me out, and the Garmin61 became an Mass storage device instead.
Deleted img-files in ".system\Map" and files in ".system\Gmx" no success, still rebooting
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