Instructables

How to compress a .ISO to a .CSO (PSP game)

Picture of How to compress a .ISO to a .CSO (PSP game)
This instructable will teach you how to compress an .iso file to a .cso file. Using .cso files saves space on your PSP. This can only be done if you are running custom firmware.

This is only for backups of a PSP game you OWN and not DOWNLOADED.
 
Remove these adsRemove these ads by Signing Up

Step 2: Download PSP ISO Compresser v1.4

Picture of Download PSP ISO Compresser v1.4
PSP ISO Compresser v1.4 can be downloaded for free at

http://www.psp-hacks.com/file/900

Step 4: Now Play!

Picture of Now Play!
Just place the .cso into your ISO folder in your PSP. Now go to the game selection on your PSP and play it.

Cheers.
dmenezes2 years ago
can i convert a iso file to gba file..please let me know
Steamdnt5 years ago
I already posted this, A long time ago
you may have done a instructable on the same subject but the software is different and has a lot more options and easier to use
flamtz5 years ago
Good tutorial, now I know how to download those... oh wait did I just say that? No... what I mean is how big are the cso's?
Ikotoo (author)  flamtz5 years ago
Thanks. The size of the .cso depends on the game but .cso are always smaller then the .iso that you compressed it from. Usually They decrease in size by about 15-30%. cheers.