This is a classic problem, often caused by region mismatches. PSP save data is not cross-region compatible. For example, a save file for the European version of the game ( ULES ) will not work with the North American version ( ULUS ). Ensure you've downloaded a repack designed for your specific game version. Additionally, if you're playing a backup copy of the game, some early cracked ISOs had file issues. You might need to patch your game ISO itself.
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Navigate to the internal storage directory: PSP -> SAVEDATA . This is a classic problem, often caused by region mismatches