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I’ve had my G30 for nearly 3 years now. I initially expected the OTA updates to update the maps, but it never has. I have had at least three OTA updates to the navigation system I can remember, but I think these must have been for software or functionality as these never updated the maps themselves.
I have used the USB update process two or three times successfully and it’s pretty easy; as others have suggested you need at least a 64gb USB stick to do it, but once loaded into the stick just plug into the car and it’ll sort itself out and tell you when it’s done. If you interrupt the process, it just picks up again from where it left off - normally takes about 15-20 minutes to update.
If you have a BMW service plan, check the small print - my plan includes map updates to be done by the dealer. Rather than paying out for a USB update, you may already be entitled for an update with your service plan.
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