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this is an easy guide on how to just save SHSH blobs in case your might ever need them. this is a very good idea to do because if you accidentally upgrade you cant go back without these.
There are two main blob savers and they are iFaith and tinyumbrella. im using tinyumbrella because they support the iphone 4s unlike iFaith.
go ahead and download tinyumbrella here:
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then open it up and you will be presented with something like this [ATTACH=CONFIG]17127[/ATTACH]
now connect your device and click on it in the upper left corner.
once selected all you have to do is click save SHSH on the right side and it will save it to your computer.
now you are ready to downgrade if it is ever needed.