How to Convert PBP to CSO

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Files with the extension PBP, like a firmware update or a custom-made file, are used by the handheld Sony PlayStation Portable (PSP) gaming system to launch software. CSO is a file extension for up to nine levels of compressed ISO disk image formats. CSO files are used to archive PSP games. In order to compress PBP files into a CSO, a program like Microsoft Windows PSP ISO Compressor must be used.

Download the PSP ISO Compressor v1.4 for Windows from It is available as freeware and can also compress in JSO and DAX formats.

CiSo Plus manufactures a free PSP ISO Compressor that reduces the resulting CSO file with a special feature called "Lost Areas." It also has dual-core enhancement and intelligent compression modes to enhance speed in gameplay.

The QPSP Manager 2.0 program by Softpedia works for both Microsoft Windows and Macintosh's Linux and OS X platforms. In additions to a PSP ISO compressor, it features a PSX ISO converter, application management, and a save-game backup system.

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