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While there are a few aftermarket 120-240 compatible EVSE devices out there, the one supplied with your BMW is not one of them.
The plug that goes into the vehicle is the same. The EVSE itself has a small power supply and logic board that runs it for things like the idiot lights, and the interlock signals. The power devices would have to also be able to handle the increased voltage as well as the internal power supply. IOW, no, it's not a universal power supply that can be plugged in anywhere. It would be nice, in that doubling the voltage from 120-240 vac would double the power delivered out of it. It would also rely on the user, potentially, being smarter.
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