TomTom home doesn’t recognise my memory card

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having followed all the instructions for doing the upgrade, my TomTom Home is telling me my device isn’t connected. The SD card is in the card reader and the computer can see it but TomTom home just doesn’t recognise it, even though it launches when I put the card in the reader. It still works fine in the car. I’ve tried selecting the menu option to remove the SD card and it tells me it’s safe to remove. I’ve tried the card in the reader of 3 different computers, all with TomTom Home installed and  the result is always the same.

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