There is no official God of War Ragnarök file for the PSP , as the game was never released for that console. The game is officially available only on PlayStation 5 PlayStation 4 Windows (PC) God of War Wiki

Step 3: Optimize the file. If you are using an emulator (PPSSPP), download the "HD Texture Packs" made by the community for Ghost of Sparta. These fan-made packs re-render textures in 4K. That is the closest you will get to a "Ragnarok" visual experience on that engine.

Part 1: The Cold Hard Truth – Ragnarök is NOT on PSP

Let’s state this clearly from the start: God of War Ragnarök (2022) was developed exclusively for the PlayStation 4 and PlayStation 5. It was never released for the PSP, PlayStation Vita, Nintendo Switch, Xbox, or PC (officially, as of this writing).

  1. A technical comparison of God of War games across PlayStation platforms (PSP’s Chains of Olympus / Ghost of Sparta vs. console titles).
  2. A guide to legally playing classic PSP God of War games today (via PS Vita, PS3, PS Plus Premium, or original UMDs).
  3. An overview of emulation legality and how to dump your own PSP game copies for personal use (where permitted by law).

So, if you see a website offering a "God of War Ragnarok PSP ISO" or "CSO file," you are 100% looking at a scam, a virus, or a mislabeled file (often a ROM hack or a completely different game renamed to trick you).