![]() There are a number of ways to backup SHSH blobs, as listed below. Note: Firmware OS software signature signing is only applied to iPhone 3Gs, 3rd generation iPod Touch (3G), iPad WiFi and iPad 3G+WiFi. But users who jailbreak or unlock is recommended to capture, save and backup the SHSH blobs in advance, just in case the exploit, vulnerability or loophole been patched by Apple, and required the device to be downgraded to earlier firmware to regain jailbreak and/or unlock functionality. Most users who does not jailbreak or unlock the iPhone, iPad or iPod touch does not need to care much about SHSH hashes or blob files. So, essentially, backing up and saving the SHSH blobs is a safeguard against accidental upgrade to new version of firmware, and when there is a need to downgrade to older version of iPhone OS software. The trick is that, once a new firmware is released, Apple stops signing the older version of firmware OS for activation, hence making it’s almost impossible to restore to earlier or older version of firmware from iTunes. Without signature, iTunes simply will not proceed to restore. ![]() ECID (Exclusive Chip ID) is passed to Apple servers whenever user attempts to restore or upgrade the firmware (OS software) on any iDecives to generate signature. Basically, SHSH blobs is digital signature signed on firmware which is unique for each iPhone, iPod touch and iPad. SHSH blobs, or ECID SHSH, is a security mechanism from Apple to prevent hacking of Apple’s iPhone, iPod touch and iPad.
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