Does your iphone have to be jailbroken to get shsh blobs to downgrade iOS?

At the moment my iphone is not jailbroken and running on 6.1.3 and i want to downgrade it to… Whatever really so i can have an untethered jailbreak. I've looked at downgrading it on youtube and it says you have to have shah blobs. I have no idea what these are or w you get them but i've downloaded tiny umbrella because thats what it says to use but now what do i do? Does my device have to have a tethered jailbreak so i can downgrade and get an untethered jailbreak? I'm really confused.

Added (1). *shsh blobs

We all need to get out more…

Yes you need to be jailbroken to save SHSH blobs. Wait for the iOS 7 release, a jailbreak will be released alongside that for iOS 7 and 6.1.3 for older devices.

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