Is there anyway still to downgrade iphone 4 to ios 6.1.3?

I upgrade my original iphone 4 to ios 7 and it is like disaster
it is working slow and have many glithes
i heard that apple stop signing the ios 6.1.3 version now
is there any illegal way to downgrade it?
i have a non-jailbroken device mean original

If you saved your SHSH blobs before the update happened, you may be able to go back to iOS 6.1.3 here by following the steps - http://www.redmondpie.com/how-to-downgra… If you didn't get your SHSH blobs saved before the update was performed, you're stuck with iOS 7.

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