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Original poster is saying BMW tested battery and it’s not low or damaged (?)
If you turn off all the accessories and just turn on the headlights when u start the car and the headlights really dim out then that is a clue the battery may be low.
If the battery connection are good and not intermittent - then, you can bypass cars battery to the starter and check that components state. On a modern BMW I’m not really sure the instructions for doing this.
If battery and starter check fine and the main ground wire isn’t corroded or lose - then the starter / ignition switch gets checked for current.
If u want to get away from just replacing parts to find the fix then you need someone either on the forum or at a shop that knows the procedures.
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