iPhone hacker and the famous Sn0wbreeze developer iH8sn0w has released a new tool, called, SHSH Blobs Extractor. It allows you to extract the old SHSH blobs signature files, even if Apple stops signing older firmware files. Since Apple no longer signs iOS 4.1 blobs, they can’t be saved through TinyUmbrella or Cydia, but the newly released SHSH extractor tool can dig deep down and preserve the blobs regardless.
According to iH8sn0w, the blobs are always available on firmware because the boot chain relies on these unique blobs. It is basically another signature check of Apple but is given to the device originally from Apple via a Restore/Update.
According to iDeviceDaily:
If you have a device that is on a firmware that Apple is not signing (example: 4.1), and you wish to grab blobs for, you can with the new upcoming tool. Just ensure that you don’t press that Update/Restore button in iTunes. Everytime you restore or update, these blobs get replaced by completely new SHSH blobs for the firmware you are updating/restoring to.
From the tweet:
@prasys working on this SHSH blob extractor. So if a new device comes with a firmware apple isn’t signing, you can dump it.
Remember one thing that this SHSH Blobs Extractor tool can’t save blobs after the device has been restored and updated, this is because the blobs are completely erased from the device.
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