I have one of the later models, with no ML module build in, but a ML socket. Took some time to figure out that I had to get the module and the socket was without function. Nice! But installing the module was quite easy.
The earlier models can not be upgraded.
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BV4-50, Beosystem 3, Beolab 5, Beolab 3, BV3-32, BV1, BS9000, Beolab 4, Beolab 2000, Beo4 Cinema