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I have a very old PSP running a custom firmware/bootmod with far more emulated games on it than I can ever play. I didnt have to make any modifications to any hardware to do it, so there may have been hardware revisions as Sony tried to keep people from being able to hack them.
Iirc, the cat/mouse game was they would release a new game and it would require OS version x.xx, which would ship on the cartand you’d have to install it to play. However, since the PSP is no longer supported, they may have reached a final OS version which got cracked for the bootmod, etc.
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