The device verifies this signature and proceeds with the installation.
Apple signs the current version, allowing you to install it. shsh blobs
SHSH blobs are created by a hashing formula that uses multiple keys, including the device type, the iOS version being signed, and the device's —a unique identification number embedded in the hardware of every Apple device. The device verifies this signature and proceeds with
When you restore an iOS version using saved blobs, you must use the SEP and Baseband files from an iOS version that Apple is . When you restore an iOS version using saved
Understanding SHSH Blobs: The Key to iOS Downgrading and Jailbreaking
A popular online tool where you enter your device’s ECID (a unique identifier) to save blobs.
Newer iOS updates are optimized for newer hardware. Older devices (like an older iPhone or iPad) can slow down significantly on the latest firmware. Saved blobs allow you to downgrade your device to a lighter, faster, older iOS version.