Don't use the iOS 6.0.1 IPSW. It's just a hotfix, not a full fledged iOS. Think of it as a sticker on a box full of stuff. iOS 6.0.1 is the sticker, iOS 6.0 is the box. If you rip the sticker off the box, your sticker (iOS 6.0.1) can't hold stuff. The box (iOS 6.0) holds all your stuff. The sticker just makes the box look pretty, it doesn't affect what's inside the box.