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All your assumptions are correct. Your dilemma is that the only way you can use the donor FSC Codes is to keep the Head Unit VIN as the donor VIN as if your change it to match the car VIN the FSC Codes will be rejected. The problem with this is that since the Head Unit and car have different VIN's, Activation will still fail.
This is why all Head Unit Retrofits have either OEM FSC Codes ordered form BMW AG matching the car's VIN or they use Donor FSC Codes / VIN and a CAN Filter / Activation Module to fool the car into thinking the Head Unit VIN matches the car's VIN.
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2018 F06 Alpina B6 650ix GC; Space Grey; Vermillion Red Nappa Leather; Executive; B&O; Driving Assistant
2017 F15 X5 xDrive50i MSport; Glacier Silver Metallic; Black Dakota Leather; Executive; B&O; Driving Assistant; RSE |