It is not possible to revert back to an older version of iOS once you have updated.
During the process of installing a new version of the iOS on your device--whether that's a major upgrade like iOS 7, or a minor update like iOS 6.0.2--the device connects to Apple's servers. It does this so it can check to make sure that the OS you're installing is "signed," or approved, by Apple. This is a very important step, because it ensures that you're installing a legitimate, official, secure version of the iOS and not something that is malfunctioning or has been tampered with. If Apple's servers confirm that the version you're trying to install is signed, all is well and the upgrade continues. If not, the installation can't continue.
This step is so crucial because if Apple stops signing its OS updates, then you won't be able to install the unsigned versions. That's what the company has done with iOS 6.
Hope that helps!
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