Best to google/bing search for 'Garmin OSM maps download help' or 'How to download OSM map for Garmin', you'll get plenty of hits.
As to how to load the map image file to your zumo, easiest and safest is to put it on an sd in a Garmin folder named gmapsupp.img. [Only registered and activated users can see links. ]. [Only registered and activated users can see links. ]
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