A (Compressed ISO) is a compressed disc image format for the PlayStation Portable. Standard PSP games are usually backed up as ISO files, which are exact replicas of the game disc. However, ISO files can be quite large, often ranging from 1GB to 2GB.
You can fit more games on your SD card or mobile device. cso psp games download
When downloading and playing CSO PSP games, it's essential to take some safety precautions: A (Compressed ISO) is a compressed disc image