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Black and white are hardwarewise the same (or at least no difference is known). But because M92's are (the both - B & W) are being manufactured in batches, there might be slight differences between batches, which is not anything unusual.
All white should have firmware that is open. Some of blacks has open firmware some (from ArtaTech distribution chanel) not.
"Not open" means that one may update firmware only by firmware provided by ArtaTech. Also M92's from ArtaTech do not have wall plug (power source) and cover.
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