Home of the Ultimate Xbox 360 Modding Tool, Horizon. XboxMB.com is a community of Xbox 360 gamers and modders who share Tutorials, News, Reviews, and other resources. Xbox Message Boards is free to sign up and use, so what are you waiting for? Register Now!
Same reply as on 360 Haven: If Horizon has problems modifying your profile and your Xbox says it's corrupt, then it is definitely corrupt. You will get the same error if you replace the 58411213.gpd file with literally anything else, valid GPD or not. Delete your profile, and download it again. Or maybe try another mod tool, it's possible others might handle a corrupt profile better or even fix it - but no guarantees.