I know its been some time but i recently put the machine back on boat after sending it out to you put a good c map card in and same issue its not recognizing the card . I wish i would have checked when i got it back but i had already purchased a 1971f. So i just put in on boat for backup. The work order said the software was updated and it worked as it should. But its not. Guess i pissed away 125.00