You don’t need one. The base game runs on FW 3.55. Even if you have a 5.05 jailbreak, it works natively without backporting.
Technical aspects
If you prefer to purchase and download God of War III Remastered directly from the PlayStation Store, follow these steps:
brings the epic conclusion of the Greek saga to 1080p and 60fps, but for those managing their library through package files, getting it running requires a few specific steps. The Essentials Before You Begin You’ll need the God of War III Remastered PKG