Look for a reputable source for the Naruto Shippuden: Ultimate Ninja Impact ISO and the specific Storm 2 texture pack.

For the best performance, use the Vulkan backend and set the rendering resolution to 2x or 3x PSP if your device allows. Official Alternatives for Handheld Play

To run this modded experience, you typically need both the base game ISO and a specific "Textures" and "Save Data" folder.

Move your ISO file into a folder on your device (e.g., /PSP/GAME/ ).

Extract the texture pack into the PSP/TEXTURES/ folder in your emulator's directory.