If you have a previous save that was at 100%, you can try reverting to that save:
If you downloaded a "100% Completed" save file from the internet:
The original Codex crack for Forza Horizon 5 was released for version v1.405.2.0. If you have updated the game using ElAmigos or an update pack, the old Codex crack will cause a 100% fatal mismatch.
The solution:
This fix not only resolves the save 100% bug but also allows you to use the Auction House and EventLab (though online is risky with a cracked copy). forza horizon 5 codex save game 100 fix
There are two ways to fix a save issue depending on whether you are downloading a new save or trying to fix your existing one.
Sometimes your save is beyond repair. In this case, you need to manually insert a 100% working save file that bypasses the corrupt header.
Download a pre-tested save:
Search for "Forza Horizon 5 100% Completion Save Codex" (credits to CS.RIN.RU users). Look for a save that explicitly says "Clean save - no 100% hang." If you have a previous save that was
Installation:
This is the most reliable method to fix the saving mechanism for the Codex version.
Step 1: Locate the Save Directory
Step 2: Identify the Save Folder
Step 3: Modify Windows Permissions
Step 4: Fix the "Microsoft Store" Issue (Crucial Step) If the above doesn't work, the "AppInstaller" or "Gaming Services" often creates new folders automatically.
Once you have fixed the issue, follow these rules to ensure it never returns: