Hello Janch!
Thank you for your patience.
Slovenia is also a very beautiful country. I worked 1970 times 3 weeks in Ljubljana. That was an exchange DDR - Yugoslavia.
Yesterday, we made a little discovery about our topic. I was looking for how to fix flash disk. I found this in the Digital EliteBoard:
https: //www.digital-eliteboard.com/resources/navigon-internen-speicher-formatieren-unmounten.1448/
This SW has loaded. The result is that now the external card slot is working again. When I connect the Spirit 6900 to PC, L: (Mio) appears with its contents.
But it comes synonymous M: and there is the contents of the memory card in the slot is inside. I have not examined anything yet.

But I also found something else. What do you say as a specialist to this?

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Greetings from the HIDDENSEE ISLAND