They are part of Apple's protocol designed to ensure that trusted software is installed on the device, generally only allowing the newest iOS version to be installable. A SHSH blob (based on the acronyms for signed hash and binary large object also called ECID SHSH, referring to the device's ECID, a unique identification number embedded in its hardware ) is an unofficial term referring to the digital signatures that Apple generates and uses to personalize IPSW firmware files for each iOS device.
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