I'm pretty sure that you no one can answer these questions.
You want to play with a very expensive system in the expensive car. Very new model. The responsibility is only up to you, it's your money.
You've got to try, then inform us which is the result if you want. Of course always do the backup before any attempts.
The only thing I can give you as general information, basemap has nothing to do with it. Basemap is not locked. Also, you can delete device.nng (backup it just in case), your navi will generate it again.



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