Because an official version never existed, "Prototype 2 PPSSPP" typically refers to one of the following:
When you see downloads or videos claiming to show "Prototype 2 for PPSSPP," they usually fall into one of three categories: Modded Games: Prototype 2 Ppsspp
Most "Prototype 2" files found for PPSSPP are actually or "skins" of other existing PSP games. Because an official version never existed, "Prototype 2