Citat:
Ursprungligen postat av Braxen82
Vad är blobbar?
"So first up, what exactly is SHSH blob or ECID SHSH? Well, it is basically is a unique signature which is checked against Apple servers whenever you decide to restore the firmware on any of your iDevice (iPhone, iPad and iPod touch)."
"Now to “why is it important to save SHSH blob”: The creator of Cydia has setup a new server which basically mimics Apple’s verification server and can save your older signature (SHSH blob) so that 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."
Taget från redmondpie.com.
Mer eller mindre en unik kod som gör det möjligt att nedgradera(återställa till äldre fw) sin JB iphone som man av någon anledning råkat uppdatera, har man inte sparade blobs så går det ej.