Open PPSSPP, navigate to the tab, browse to your folder, and select your game.
If you are looking for a list to guide your search, these are reputable community-driven sources: psp iso archive top
You may also encounter .CSO files. These are simply compressed versions of ISO files designed to save storage space on memory cards, though they can occasionally result in slightly longer loading times during gameplay. Open PPSSPP, navigate to the tab, browse to
The Internet Archive is a non-profit digital library dedicated to preserving cultural artifacts, including software and video games. Users upload massive "Romsets" containing complete libraries of PSP games. navigate to the tab