If you meant something else by "shsh blobs" (e.g., a specific error message, or you're looking for a tool/tutorial), please clarify, and I’ll give a more targeted answer.
Starting with iOS 5, Apple introduced a nonce —a random string of numbers generated for every single restore attempt. This means a saved blob will only work if your device generates the exact same nonce that was used when the blob was originally saved.
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