MGS 2: Sons of Liberty - SecFixer
How to use:
1) Run the editor, click on "DECRYPT" and open your MGS 2 save (Make sure you select the STFS container and not the files inside).
2) In the same directory are 2 new files "Data.bin.dec" and "Master.bin.dec".
3) Hex edit them with a hex editor.
4) Open the editor again and click on "ENCRYPT". The 2 files and the STFS container must be in the same directory.
5) The STFS is updated, rehashed & resigned and ready to use. Have fun!
Will update the tool soon, because the code is still very ugly lol.
Let me know if you have problems, so I can fix them.