Thread: Post here please your help request regarding Garmin

dont release it till it wont enter preeboot mode-
Because you must start the Nuvi in so called "Pre-Boot Mode"
be sure to have the latest drivers
when windows recognizes it you can try to browse your unit to delete the map that caused the problem.

Unlocked maps or similar should be used on an sd, if something goes wrong you must just remove it.
if it doesnt work you should ,in preboot mode, update your unit with a special firmware that doesnt see the wrong maps
After that your unit should boot. And there should be only basemap shown (no gmapsupp, no gmapprom, gmapprom1 visible).
So you could connect it as a Mass Storage Device and DELETE wrong gmapsupp .
google for it