My iPhone stuck in Soft DFU, why?

I have a iphone 4. I wanted to downgrade from iOS 7 to iOS 6.1.2 with SHSH blobs, but then itunes finished with downgrade it doesn't boot. My iphone stuck in softdfu. Why? How to fix it?

I don't believe that you can downgrade to anything lower than iOS 7 once you are running iOS 7.

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