Firmwares running higher than 3.71 use a newer version of pspfatmod.prx. In 3.80 Sony heavily optimized it so that anything higher than a 4 GB Memory Stick would run CSOs slowly.
http://alek.dark-alex.org/pspwiki/index.php/Fatmsmod
If you want to run backups of your games either be sure they are ISO and NOT CSO or install the fatmsmod. Since the fatmsmod.prx is so heavily optimized, it can't decompress CSOs fast enough to server to the screen. So if they are just in ISO format they run fine.







button. Thanks.
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