Hi Torjus, I have the same problem with marine gps echoMAP Plus 74cv and Bluechart G2 Vision (v13/v16 and v17.5). Using gimgunlock the gps says " . . . problem with authentication of map", but using KG with *.unl the gps says "Can't unlock map".
So, in my opinion, some newer gps could have a different method to validate the maps.
The question is, Who knows how to unlock the maps in the new line gps with restricted firmware?.
Regards.
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