Dump your UMD using Custom Firmware on a PSP. Hold the R-trigger on boot to enter the Recovery Menu, enable "USB device: UMD," then plug into your PC. Copy the UMD.ISO file.
A (Compressed ISO) file is a compressed image format used to archive and play PlayStation Portable (PSP) games. It was developed to save space on Memory Sticks by compressing standard ISO files while remaining playable on devices with custom firmware. 1. Understanding the Format cso psp archive
The PSP is a retro console that is experiencing a renaissance. With the official PlayStation Store for PSP closed, the only way to play these games on original hardware is via digital backups. The is the bridge between massive disc images and limited flash storage. Dump your UMD using Custom Firmware on a PSP