While RPCS3 can run loose "folder" dumps, using a patched ISO created with an IRD file is often superior.
Use 3K3Y to "Modify" the ISO and inject the correct IRD header. Incorrect region IRD. mgs4 ird file patched
To verify and "patch" your MGS4 copy into a working ISO, you will need a tool like or 3K3Y ISO Tools . While RPCS3 can run loose "folder" dumps, using
Ensure the IRD ID matches the PARAM.SFO file in your game folder. 🚀 If you'd like to move forward, I can help you with: Finding the specific Product ID for your version of MGS4. Setting up RPCS3 custom configuration to stop the crashing. mgs4 ird file patched