Downgrading iOS firmware from 7 to 6.1.3?

I saw a YT vid, and followed the steps. I downloaded iFaith, got the shsh blobs out of Cydia and created a custom ipsw. Now when I try to shift+restore in iTunes it says that I need to install a newer version of iTunes (11.1) but the dude in the vid said that it only works on the older version. Fix? BTW i have a gsm iphone 4.

An older version of iTunes

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