CSO is a compressed version of an ISO. It is good because it will take up less memory on your memory card but the game will be less stable than an ISO. It all depends on how much memory you have to spare. Also don't think think that CSO's are completely unstable, they may just have some rare issues.
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*.cso and *.iso are the formats of the psp games
You need to have a custom firmware to put iso/cso games. 1. put your psp in usb cable. 2. make a folder name " ISO". 3. go to Websitef to get your games then put it in the folder. 4. exit out then press select the you go to the 4th row the go to the secong last and put it no umb sony. 5. then you go to ur game folder and there you go ur iso/cso.
.CSO is a compressed file format, generally used on PlayStation Portable games.
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