It might be different in North America but, for mine in the UK, I download via my Connected Drive portal. To start the download and subsequently extract the files onto a USB dongle I have to enter the 7 digit part of my X1 VIN, which personalises the download for my car. Could it be, I wonder, that the reason people may be having problems with updating their Navigation maps, as outlined in this thread, is because the car doesn't recognise an 'unpersonalised' download. Just a thought!
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