Keep riding the frontier, but do it on hardware that can handle it. Your PSP deserves better than chasing a file that never existed.
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Devices like the Retroid Pocket 5 or Anbernic RG556 run . Since Red Dead Redemption never came to PS2, this doesn't work for RDR itself... but they run Gun and Red Dead Revolver (PS2) perfectly. Keep riding the frontier, but do it on