I have a problem with my zumo550 and its external SD card.
I noticed that the device can't boot when the external SD is inserted, but only when the POI directory is copied inside, it's like a rejection of the data from the device.
Does anybody know anything about it?
Have read that Garmin recommend 8 gig card as maximum, but others have said that they go higher. Suggest formatting the card then booting with it inserted first. Did you load POI file to the card yourself or do it through POI Loader?
If you just copied it over it could be the problem.