Your PSP must run a custom firmware like PRO-C or LME to read ISO/CSO files from the memory card.
Let me clarify a few things:
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CSO (Compressed ISO). This format reduces the game size, making it faster to download and better for limited PSP storage. Platform: PSP / PPSSPP (Android, PC, iOS). Your PSP must run a custom firmware like
was released for PC, PlayStation 3, and Xbox 360. The 2022 reboot is available on PC, PS4/PS5, and Xbox One/Series X|S. Scam Risks: iOS). was released for PC