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Depends on how they code it. Lane change assistant can be VO coded so would persist after a software upgrade if the FA was written to the car.
FDL coding will be erased during the second phase of the coding session, where the car is VO coded against the car's current FA.
Personally, I wouldn't take a BMW, still under warranty, to a dealership with any modified FA or FDL coding active.
Many will say that there is practically no risk and they never bother to revert the coding, and most of the time they are right, but they don't know what i do.
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