Re-dump the original files; mods should be applied after verification. The ISO was created without an IRD.
Use 3K3Y to "Modify" the ISO and inject the correct IRD header. Incorrect region IRD. mgs4 ird file patched
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. Re-dump the original files; mods should be applied
An IRD (Internal Reference Data) file is a blueprint of an original PlayStation 3 game disc. It contains the specific metadata, header information, and file structure required to verify that a game rip is a 1:1 copy of the retail product. It checks if files are missing or corrupted. Incorrect region IRD
Download the IRD file that matches your game's ID (e.g., BLUS30109 for the US version or BLES00246 for Europe).