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I’m thinking maybe you need BMW-specific software
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Yes, I don't know what the BMW coding tool is called.. In the Porsche World, You need the PIWIS, and beside getting an ECU that closely matches the car, you need to get a learn code from a dealer, this is besides VIN etc.. I would get in touch with someone like ECU Doctors.. and see if they are able to help... Even a 17 year old ECU is not a plug and play..
ECU Doctors