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Maybe they are trying to restrict access to the files as best as possible to stop people from trying to be too clever, dicking about with them, bricking their car, and then go whining to BMW to repair.
Would be a load easier though, and sure they could implement some decent checksums to ensure modified code doesn't get attempted.
Most other manufacturers with products with downloadable firmware seem to be able to manage it.
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'21 BMW 330e xDrive ///M Sport
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