Go to memory on your console and move your GTAV Save Game onto your USB. Then go to Horizon and extract your old save to your desktop. Download the modded save proved below. Drag both non-modded and modded saves into Horizon into that gray box area. Copy your ID's from your old save onto the modded save and save, rehash, and resign! After that click save to device, yes, yes and ok. Then insert your USB back into your xbox and load up GTAV! Then click USB Device once it gives you the option! (BTW when it says modded I mean this save)