Navigate to your game (e.g., God_of_War.iso ). Press the O button (or X depending on region).
Download the iso_tool ver.1.31 archive from a trusted source. The official source was typically the developer’s blog ( takka.tfact.net ). The file will come in a compressed format, such as a ZIP file.
This article is a comprehensive deep-dive into ISO Tool 131: what it is, why it remains relevant, how to use it, and the legal landscape surrounding PSP ISOs. iso tool 131 pspiso
The tool can extract a digital ISO copy of a physical game disc (UMD) directly to the console's storage.
: If a patched game fails to boot, you can often fix it by pressing Select on the home screen and changing the UMD ISO Mode (e.g., to "M33 driver" or "Sony NP9660"). Comparison of File Formats Navigate to your game (e
The utility became a staple of the PSP modding community due to its dense feature set:
Allows users to decrypt EBOOT.BIN files and apply Prometheus or version patches, enabling older custom firmware versions to run newer game backups. The official source was typically the developer’s blog
: Navigate the list of detected ISO/CSO files. Pressing the Triangle or Circle button (depending on the region) opens a sub-menu with options like "Convert," "Patch," or "Rename."
This often requires a game-specific patch. Check if a known patch like "ME631" is available within the Prometheus menu in ISO Tool and try applying it. The community around popular games often releases specific patch files that can be added to ISO Tool.
Corrupted PSPISO or insufficient RAM on PSP-1000 (Fat model). Fix: Re-download the PSPISO. On PSP-1000, enable “Memory Stick Speed” in the VSH menu. Use a smaller compression level.