In Chinese PSP gaming communities, “完美CSO” (perfect CSO or perfect RIP) refers to compressed images that reduce volume through compression technology without deleting any game content. However, not all games can achieve perfect CSO status—those containing large amounts of music and animation files often require manual intervention.
(Mobile/Modded) : Often found in "highly compressed" lists (around 350MB), though users should note these are often Android versions or specific mods designed to run via emulation. Batman: The Dark Knight Rises batman psp highly compressed
PPSSPP is also available for iOS devices (through AltStore or sideloading). Highly compressed CSO files work particularly well on iOS due to limited storage availability on many iPhones and iPads. In Chinese PSP gaming communities