Thanks to pro-active support of Catymag, I solved the issue.
Finally it's the "Unlock Key" given in this tutorial that was not valid for my device (turkisk map unlocked in mapsource but locked in my Nuvi 255 after transfert).
You just need to download Jetmouse Keygen (key generator for Garmin), in which you have to precise your GPS ID and the Map ID, then generate an unlocked key that you will use to unlock the map in Mapsource ... and map will be also unlocked in your GPS after transfert.
Thanks again to Catymag for her tremendous support
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