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Adding an ADDITIONAL faster processor is proven tech. Heck, Nintendo was doing that with $70 cartridges 20 years (e.g. the FX ship used in games like Starfox essentially overrode the built-in processor, but the main CPU in the console was still used for basic IO.

It's when you're talking about actually REMOVING that built in processor that things get really interesting.

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Well, there's no particular reason that part couldn't be swapped too, sort of like swapping the motherboard in a PC and then connecting everything else you already had. Yes, that would be essentially upgrading to a "new" phone but if the standard held you could still use the screen, camera, memory and so forth which isn't possible now (potentially later upgrading those bit by bit as need be).

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