Restore iPhone 4s to original factory settings
HI, I'm trying to restore an iPhone 4S to it's original factory settings. But when I attempt this on iTunes, it says I can restore it, but that it will automatically update the phone to the latest software, which I don't want. The problem is, the latest software is now screwing up the functions of the phone which is why I'm trying to now restore it it's original factory settings. Does anyone know how I can restore the phone to it's original factory settings without updating it?
iPhone 4S, iOS 8.0.2