I'm not a big FF fan and all this hype about the crisis core if its a umd disc then it should work if its an iso upgrade to 3.90 m33-2 i play my backups perfectly with that oh but before you upgrade try turning on the no umd feature in the recovery menu maybe thats why u cant play it if its an iso or if it isint a iso check to see if the no umd feature is set to normal
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