Originally posted by Watcher
You need to resign the save to your own profile before your game will accept it. The best thing you can do is BUY Xploder (Google it, it's $15) or there is free resign services on the forums in the Trophy hacking section. Good luck!
Sounds like you need Xploder's kit, the links below if you're interested:
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There's a PS3 and X360 version.
Hope that helps,
sadie