Does the editor even run?
If it doesn't, then you'd need somebody else to help. I'm on an older Windows so may not be familiar with how it works on newer versions. The .zip file from
https://github.com/Nenkai/GT4SaveEditor/releases should contain an executable, which is the editor itself. Extract the app before running it.
If it does open, then you'd need to extract the content of the Spec II save for the editor to modify.
Disclaimer: I play on PS2 and the following is how I modify my saves so PCSX2 may work differently (instructions from
https://github.com/Nenkai/GT4SaveEditor/releases/tag/0.6.0 maybe helpful). Regardless, it's crucial to make a backup of the memory card file before continuing. I'd simply zip it. A corrupted save or MC file is on you from here on out.
A memory card file may contain saves of multiple games. A GT4OPB save is BASCUS-97436GAMEDATA so this is what you'd be working on.
1. Run MyMC: "Open MC1", open the .bin save file, select the BASCUS-97436GAMEDATA, "Export save". Leave the app open.
2. Run PS2 Save Builder: File, Open, open the exported .psu file, select both BASCUS-97436GAMEDATA and garage, right-click, Extract, save. Leave the app open.
3. Run Nenkai's editor and open the location where Builder extracted those 2 files to. Modify whatever you want, then save. I recommend saving to a different location in case your modification isn't compatible with the game because the editor was not updated for Spec II.
4. In Builder, delete both source BASCUS-97436GAMEDATA and garage, leaving you with the 2 icon files. Drag and drop both modified files to builder. Save as either AR MAX v3 (.max) or Code Breaker (.cbs) format. Exit when done.
5. In MyMC, delete the source save (Warning: this actually deletes the save from the MC file so check if you've made its backup), "Import to MC1", open either the .max or .cbs file. Note the updated "Last Modified" time. "Close MC1" after you're sure that the save has been applied. Exit when done.
I recommend to delete the exported .psu file from step 1 after you're sure that the modification is working. There is a bug with my MyMC copy where a future export doesn't overwrite an existing .psu.
You can also delete the 2 extracted files from step 2 or the saved files from step 3 after done with editing.
Regarding the editor, I noticed that modifying anything unavailable/removed in OPB/Spec II may glitch the game so I'd edit only what's needed and only an item at a time. Iirc, the "Withdrawn credits" breaks the cheat shortcuts.
