Developer McCaulay (who shared a video of Cturt's Mast1core exploit running on PS5) has released a library to create and analyze PS2 save files, which can be used to modify Okage saves and test Mast1c0re exploit on PS4 and PS5.
00:00 intro
01:10 testing PyPSU commands
09:12 PS22PS4 OKAGE Emu test
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► PyPSU https://github.com/McCaulay/pypsu
► PS22PS4-GUI https://github.com/Nazky/PS22PS4-GUI