: It is safest to use modded saves while offline to avoid leaderboards bans.
If you're still interested, I can provide more information on Forza Horizon 1 save editors. forza horizon 1 save editor xbox 360
Plug the USB back into the Xbox 360 and load the game from that storage device Recommended Tools Horizon by WeMod : A popular, general-purpose Xbox 360 modding tool XB36Hazard's Save Editor : A community-favored tool specifically for Forza titles Se7enSins Forums : It is safest to use modded saves