: Handles asynchronous downloads of .cso files. It should include resume-capability (using Range headers) to handle the typically large file sizes (ranging from 200MB to 1.8GB).

: A modded PSP with Custom Firmware (CFW) or the PPSSPP Emulator .

To download and play CSO (Compressed ISO) games on your PlayStation Portable (PSP)

In the context of PSP games, a standard "rip" of a UMD (Universal Media Disc) results in an .ISO file—a bit-for-bit copy of the data on the disc. A typical PSP game ISO ranges from 300 MB to 1.8 GB (the maximum capacity of a UMD).