I had the same problem, sadly on 3.90 m33-2 pops aitn working for MOST games.
So currently im going back to the 3.80 m33-5 where the psx games worked.
I'll post what happens, im currently trying to get Digimon World 3 working on the psp.
Results:
PSX game on 3.90 m33-2: FAIL
PSX game on 3.80 m33-5: succeeded!
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