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From what happens with some of the older vehicles (and it may still be true for the new ones), when the dealer hooks it up to their diagnostic computer, the software is actually coming from the server fed from Germany. On older ones, the coding is customized for the individual modules and options in the vehicle...IOW, it's not a single block of code. This may or may not be how it still is, but this is for history on how it was done. That may also be why they don't just send out a blanket version for every vehicle and let them download it...what you may be getting is potentially unique to your vehicle, and it may need to be built (of standard modules, I'd assume) so all of your options work correctly. It may just be the selection of the numerous software switches.
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