: This refers to the full-size retail PSP games. ISO files are uncompressed, exact digital copies of the original UMD discs, offering the fastest loading times. CSO (Compressed ISO) files are compressed formats used to save precious space on Memory Sticks, though they can occasionally cause minor stuttering in asset-heavy games.
This is the most specific part of the title. It refers to the Custom Firmware (CFW) version required to play these games.
Do you need assistance versions? Share public link
If it does not exist, create a folder named ISO directly on the root. Transfer all .iso and .cso files there.
—represents a "golden age" collection of homebrew and retail backups. Breaking Down the Technical Specs
: It is highly resistant to "bricks" and has a robust recovery system. How to Install and Play