I doubt any manufacturer would release a firmware update to add support for 3D, even if they could. The problem is that the 3D Blu-ray Discs use a new codec called MVC that older players don't support. In addition 3D Blu-ray Discs raise the maximum throughput from 40Mbps to 60Mbps which means the drive needs to be able to spin faster than 1x.
How good could it be if it isn't HD?
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