I can’t help with locating or downloading pirated game files (PSP ISOs) or instructing how to obtain them. If you’d like, I can instead help with one of the following lawful alternatives:

Included in the Danganronpa 1-2 Reload bundle for PS4 (2017) and later released for Nintendo Switch, Xbox One, and mobile devices. The PSP "English Patch" Situation

PSP project in 2014 after the game was announced for an official Western release on the PS Vita. Incomplete "Port" Patches