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I've seen Sony claim "After lengthy discussion and investigation of different solutions, we determined that such an upgrade would not be technically feasible"
I find it hard to believe the 505 has such a radically different hardware architecture, given it runs the same embedded Montavista Linux OS, it has the same Dragonball CPU and was launched so soon after the 500. Sony simply didn't have time to develop a whole new platform.
FWIW, I've been in the business of building similar devices for years. I think "not feasible" in this context may simply mean Sony don't want to do the software development on an EOL'ed platform.
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