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I am on iOS 8
and
I want to downgrade to iOS 7.1.2 Can i do it ?

What's with all the formatting? Makes it seem like a troll post.

To answer your question, no you cannot. The only device that you could downgrade would be the iPhone 4 and other A4-based devices but they don't support iOS 8 so there would be no downgrading the iPhone 4 from iOS 8 to 7.1.2. Even then, you would need your SHSH blobs.

The window to downgrade ended Sept. 26th. Even if you have your SHSH blobs it is impossible, at least for right now until someone figures it out.
 
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