It seems to me you're doing everything correctly, I suggest that you either upgrade to 3.70 m33 so maybe some homebrew thing fixes, or you could try to format the ms and try again, and finally you could try an older version of cps2psp that works on slim, I posted about one older version that worked but now I can't remember which. Also, you could try the converter from an older version and hope it works, just some ideas that could help, I can't think anything better sorry.
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