When a new iOS version patches a major vulnerability, Apple quickly stops signing the older version. This prevents users from downgrading to a vulnerable firmware version.
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By "saving" these blobs while Apple is still signing a specific iOS version, you create a "golden ticket" that may allow you to downgrade or restore to that version later, even after Apple has stopped signing it. Key Concepts Device-Specific : Every blob is unique to a device's When a new iOS version patches a major