iPhone 4s iFaith SHSH blobs error

Hey guys, I wanted to downgrade my iDevice from iOS 6.1.3 to iOS 6.1.2. So I downloaded iFaith and I downloaded blob for iOS 6.1.2. But when I want to use 'build' option to upload my blob, It tells me an error. It shows me a really big texts and in the end it tells me: Also, the blob you are using is not for this build of iFaith? What shut I do? I've got 1.5.9 version so I have to download some other? If ye, then wich version? please help me!
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