The original Naruto Shippuden: Ultimate Ninja Storm 2 was never officially released for the PSP (PlayStation Portable). However, "PPSSPP files" for this game are popular fan-made mods—usually built on the engine of Naruto Shippuden: Ultimate Ninja Impact—that attempt to recreate the Storm 2 experience on mobile and handheld devices. Review of the Storm 2 PPSSPP Mod Experience
Because it is a mod, there isn't one "official" version. Most files you will find are ISO images of Naruto Shippuden: Ultimate Ninja Impact Naruto Shippuden Ultimate Ninja Storm 2 Ppsspp File
Some mods include character skins or "new" jutsus to make characters feel like their counterparts. Audio/Visuals: The original Naruto Shippuden: Ultimate Ninja Storm 2
Naruto Shippuden: Ultimate Ninja Storm 2 was never officially released for the PSP/PPSSPP ; however, it exists on the platform as a Most files you will find are ISO images