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Ah the nostalgic days of obsessing over wololo to see if my firmware was finally going to be supported.
IIRC for the PSP there came a day where you could run code straight from the external storage card without needing anything else. Which led to bootable game ISOs from the vanilla UI.
I could be remembering things wrong as it has been over a decade.
I love stupid exploits like the patapon demo exploit where you use a specific save file as the payload entry point. That’s what I like the most about exploits. Or how for Nintendo consoles all the Smash games can be used to install cfw.