sony likes locking down its firmware to developers, the only reason the PSP has homebrew is that there was nothing stopping it in version 1.00, and easily bypassed in 1.50. and the sheer amount of psp owners, I'm sure the amout of PSP owners to PRS owners are in the 1000:1 ratio.
Sony has no intentions of using even a writing functionality on the thing, only button tapping. the IREX devices, and future touch screen readers have that type of functionality.
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