Cso Psp Archive

Complete Guide to CSO & PSP Archives

7. Compression Level Guide

1. Open the tool.
2. Select ISO file.
3. Choose compression level (1 = fast, 9 = small).
4. Click “Compress” → output .cso.

| Problem | Likely Cause | Solution | |---------|--------------|----------| | "Corrupted data" on PSP | CSO compressed at level 9 | Re-compress at level 1 or 2 using CISO | | Emulator crashes on launch | CSO header corruption | Verify with csoverify tool | | Audio stuttering in cutscenes | Too high compression for original CPU | Switch to ISO or level 1 CSO | | Can't find CSO in PPSSPP | File extension not recognized | Ensure .cso – PPSSPP doesn't auto-open .zip or .7z | | CSO larger than original ISO | Zero compression + padding | Extract to ISO and recompress properly |

Troubleshooting Common CSO Errors

Save States vs. In-Game Saves: