Any Help for Neophyte?

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I have a jailbroken iphone for one purpose...blocking unwanted calls. I did it myself about 18 months ago and don't know what I am doing. I still am running 5.01. How can I upgrade to 5.11? I accidentally ran a Sleeper's backup to make sure it worked and I think lost the SHSH blobs. Anyone have any suggestions. Thanks so much.

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