For users preferring a graphical interface, CISO GUI allows drag-and-drop compression of ISO files with adjustable compression levels (1 to 9).
Rename your archive files clearly (e.g., Game_Name_USA.cso or Game_Name_Europe.cso ). Avoid excessively long names or special characters, which can sometimes confuse older custom firmware. cso psp archive
: It applies DEFLATE compression to standard ISO files, typically reducing file size by 40–60% . For users preferring a graphical interface, CISO GUI
: The preferred balance of space-saving and compatibility. It is supported by nearly all Custom Firmware (CFW) and emulators like PPSSPP. For users preferring a graphical interface