It can only be done for iPhone 4 or older that were jailbroken on the old firmware, and have SHSH blobs saved.
If you have an iPhone 4 or older device and have SHSH blobs saved for the firmware you want to downgrade to, you can follow this guide:http://www.digitaltrends.com/mobile/how-to-downgrade-to-ios-6/
If you have a newer device than iPhone 4 or do not have SHSH blobs for an older firmware, I'm sorry but you have no way to downgrade...
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