[mkgmap-dev] Maps are corrupt when using --code-page=65001 [Zumo XT]

On my shining new Garmin Zumo XT I can't seem to be able to build unicode maps, when I start the device I get "Maps are corrupts and connot be used." I'm using the latest and greatest mkgmap r4525, fresh pbf from geofabrik - to reproduce: wget http://download.geofabrik.de/europe/malta-latest.osm.pbf java -jar ./mkgmap.jar --code-page=65001 \ --family-id=10030 --product-id=1 --route --bounds=bounds.zip \ --precomp-sea=sea.zip --gmapsupp ./malta-latest.osm.pbf Anything I can try? --code-page=1252 works as a charm Thanks! Enrico