God of War: Ascension was never officially released for the PlayStation Portable (PSP) . It was a 2013 exclusive for the PlayStation 3 (PS3)
This is the best modern solution. Install RPCS3 (the PS3 emulator) on your Steam Deck or Windows handheld. With proper settings (SPU block size set to Mega, preferred SPU threads to 2), God of War: Ascension runs at 30-40 FPS on Steam Deck—fully portable, fully playable. No “PSP ISO” needed; you’ll need a PS3 disc dump (JB Folder format). god of war ascension psp iso work
PSP ISO Work
Developing a game for the PSP was a challenging task, given the handheld console's limited hardware capabilities compared to its home console counterparts. The PSP's processor, a 333 MHz MIPS processor, was significantly less powerful than the 3.2 GHz Cell Broadband Engine found in the PlayStation 3. This meant that the developers had to optimize the game's performance to ensure a smooth gaming experience. God of War: Ascension was never officially released