Problem putting iOS 7 on iPhone 4?

I have an iPhone 4s and I put the iOS 7 on it without any problems. However, a couple of my friends have the iPhone 4 and when I attempt to update them, it won't let me. It says that there was an error installing the iOS 7 and that I have to completely restore the phone and THEN I can put the new iOS 7 on. Note: the phones are updated to the current 6.1.3 and it doesn't do this to all of the iPhone 4 phones; I did a 4 yesterday and it was totally fine. I did one today and I had to end up restoring the whole thing. I know that there are different iPhone 4 phones like one can be a CDMA and one can be a GSM, and I'm installing the correct version of iOS 7 according to what phone it is.
I just don't understand why I randomly have to restore some of the iPhone 4 phones!

Alright Apple geniuses… I hope you can figure this one out.

I don't think it even runs on iphone 4.

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