I had to use various different USB sticks to get it to work. I've eventually found one (I think it was a mid-price Sandisk) that the car seems to get on with and, as others have posted, it's then just a matter of leaving the car enough time to do the update.
The pain for me is that the same USB port that is needed for the maps update is the one I use for Apple Carplay (so that's effectively out of commission while updating).
I only update the UK/Ireland/Iceland (I think it's North West Europe) because I've no plans to be driving further afield. I'll do a bigger update as and when I need it.
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