How to downgrade ios 6.1.3 to 6.1.2 on iPhone 4? Is that possible?

I've shsh blobs saved for all the firmwares I've updated on my iPhone 4 till now, so there's shsh for 6.1.2 as well. I'm tired of slow processing of 6.1.3, and don't want to wait for ios 7 as it's too far away and I don't want to have beta versions done. Let me know if I can downgrade.

Yes use the new redsn0w with you shsh blobs to downgrade to 6.1.2

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