@paperosolitario

You can just format with prepusb and then create folder Garmin ( NOT GARMIN ) and see if xml will bi created.
If don't work, then try with cure, and after this flash with original fw in pre boot.

@bobokom

format it with prepusb and after this you also create empty new folder with name Garmin, when you turn off/on nuvi you will have xml inside and you can run webupdater and update all.
If all go Ok your nuvi will start normaly ( please, use webupdater for update your device ).