A team of fans known as Square Phoenix have put this together
CISO XP - ISO to CSO and CSO to ISO Converter. PSP ISO compressor.
Version: 1.0 File size: 646 kB Downloads: 332696 Last download date: 2021-08-05 21:16:25 Operating system: Windows (all editions) Licence: Freeware
Sony PSP ISO file converter. Allow to compress / decompress CSO or ISO game files. Just drag & drop ISO or
CSO file to start process. Required PSP custom firmware with .CSO file support (ex. Dark-AleX .m33, TN-A, PRO)