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      02-01-2013, 05:20 AM   #5
mjafin
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Drives: BMW e92 320d auto
Join Date: Jan 2013
Location: Stockport

Posts: 6
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Ask another dealer? I had an E60 in Germany and went from Radio Professional to Professional Nav. The way it worked was I first took the car to BMW to update to the latest software*, then retrofitted the sat nav overnight and took the car to BMW the following day to program the new unit with the specs of the car. I wonder why this wouldn't work for the 3 series (obviously I'm extrapolating here).

*It was a necessary step to first update the car to the latest software _before_ the retrofit coding.
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