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I updated the map to 2017-1 (purchased from bmwfsc.ca).
The process was straight forward. I didn't start up the engine. Instead I charged the car battery to 100% and left it hooked up the entire time.
Start the car in Radio-Ready state. Left the door ajar (helps to have garage), switched off any lights and switched off iDrive screen via preset. Check-in every 10 minutes.
All done in over 30 minutes. I used separate USB sticks for ease since I have many lying about.
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