For those who don’t know what’s this for.. Apple has added a new security system called ECID. ECID stands for Exclusive Chip ID which is unique for all devices. iPhone 3GS, iPad, iPod Touch 3G, iPod Touch 2G MC and almost every upcoming iDevice is affected by this security.
Now what this security does is when someone updates his iPhone 3GS, iPad, iPod Touch 3G, and iTouch 2G MC to a newer firmware without saving ECID SHSH blobs, they not only lose their jailbreak but also the ability to downgrade their iDevice to an older firmware. But if you have ECID SHSH saved for an older firmware, you’ll always be able to restore back to that firmware and then jailbreak your iPhone, iPad, iTouch.
As the Spirit jailbreak for iPad 3.2, iPhone 3.1.3 and iPod Touch 3.1.3 would be out anytime now, and GeoHot has also demonstrated iPad 3.2 jailbreak with blackra1n, it’s the best time to save SHSH blobs for your iPad, iPhone 3GS and iPod Touch 3G to secure your future jailbreak because Apple may release a new firmware update soon after the jailbreak is out to patch the exploit used.
In order yo save SHSH blobs for iPhone 3GS, iPad and iPod Touch 3G, you can either use AutoSHSH RC2 or Firmware Umrella. AutoSHSH involves just a single click while the Firmware Umbrella involves a few steps to backup your ECID SHSH on file.
Download AutoSHSH RC2
Follow the guides linked below for AutoSHSH and FirmwareUmbrella to save SHSH on file. (Steps are the same for iPad, iPod Touch and iPhone)