iPhone/iPod Touch SHSH Blob File
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What is an SHSH file?
An SHSH file is a system file used by iPhone and iPod Touch devices. It saves authorization information for device firmware updates. SHSH files save information specific to each individual device and disable the ability for devices to downgrade their firmware.
SHSH files are sometimes used when "jailbreaking" iPhones and iPod Touch devices. When saved from a device, these files are sometimes used for loading downgraded firmware versions. Programs such as TinyUmbrella are used to save the SHSH files.