The game's encryption binds saves to specific accounts. You must find your hexadecimal XUID to "sign" the 100% save. XUID lookup website (often linked in modding Discord communities). Enter your Xbox Gamertag Copy the resulting hexadecimal XUID 3. Prepare the 100% Save File
You cannot use a "raw" save file from another user. You must use a swapper tool or a custom script that re-signs the save file with your specific XUID. forza horizon 5 100 save game microsoft store top
While having every car is tempting, modding save data comes with significant warnings: The game's encryption binds saves to specific accounts