God of War: Ascension was released for PlayStation 3, not PSP. It cannot be played on PPSSPP (a PSP emulator). The PSP has two GOW games: Chains of Olympus & Ghost of Sparta . Many fake sites claim to have “Ascension for PPSSPP” – those are either viruses or mislabeled ROMs. The post below addresses this while giving you the best working alternative.
If you want to play God of War on your Android device using PPSSPP, there are two official titles developed specifically for the PSP that run perfectly: god of war ascension ppsspp android download full