iGO or device do not recognize it?
In device > IGO 8 > content > map > put only basemap.fbl. Use - download [Only registered and activated users can see links. ].
Format card o FAt32. Make folder addons in root of card. Then in it create folder content. Then transfer all other files in it, respecting the nomenclature, as it was in the internal memory (buildings, map, poi).