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Ota updates are just small updates, the usb method will be a full update which for the U.K. (which includes most of Europe) is about 32GB in size.
So presumably previous owner did not bother updating maps via usb updates hence it showing as 2017.
If you can usb updates on you connected drive login , you should be able to download . Note it's buried in the webpage , not laid out very well to find to be honest.
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