ECID SHSH is a unique signature which is checked against Apple servers whenever you decide to restore the firmware on any of your Device. Once a new firmware is released, Apple stops signing the older firmware, hence making it impossible to restore back to the older firmware from iTunes.
And Why Should I Save SHSH Blobs?
By Using a SHSH blob, you can downgrade or restore back to the older firmware. This is important because if you don’t have your SHSH blob saved, and accidently update to new firmware, you’ll loose your jailbreak and furthermore, you wont be able to downgrade back to older firmware to re-jailbreak your device.
Procedures:
Step 1: Download TinyUmbrella 4.02.04 Here
Step 2: Make sure you are running iTunes on your Device.
Step 3: Now Connect your Device to Computer via USB
Step 4: Launch TinyUmbrella and Click on Save SHSH, Now your SHSH blob will be saved on Cydia Server by default or on your computer if you have chosen to.
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