If I bought an iPhone already at 6.1.3 do shsh blobs for 6.1.2 exist on the phone?

Trying to downgrade to ios 6.1.2 without losing data by using shsh blobs but I bought an iPhone that already had ios 6.1.3 installed. This is probably a simple question but i just want to make sure.

Ok for one thing you can't just download shsh blobs, they are linked to your device so unless you backed it up yourself whilst you were on 6.1.2 then its impossible (more or less) to downgrade to 6.1.2

also lets say you did have the shsh blob and want to downgrade, it will still wipe your phone, there's no way to save the data on your phone when doing something like that, but just back up in itunes then restore from backup after and your sweet.

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