Shsh Blobs -

Starting with iOS 5, Apple introduced a —a random number generated for each restore request. This means you can't just "replay" an old blob; the blob must match the specific nonce your device is currently expecting. Advanced tools (like FutureRestore ) are often required to manage nonces and successfully use your saved blobs for a downgrade. Engineering Security - School of Computer Science

(Exclusive Chip ID). You cannot use someone else’s blobs to restore your own phone. The Signing Window : You can only save blobs for iOS versions that Apple is currently signing shsh blobs

An (Signature HaSH) is a unique digital signature that Apple uses to verify the firmware version you are trying to install on your device. Every time you restore or update your iPhone via iTunes or Finder, the software sends a request to Apple’s servers. Apple then "signs" this request with a blob specific to your device's unique ID (ECID) and the specific iOS version. Starting with iOS 5, Apple introduced a —a

In the world of iOS customization, (Signature Hash Blobs) are essentially the "digital keys" Apple uses to control which versions of iOS you can install on your device. What are SHSH Blobs? Engineering Security - School of Computer Science (Exclusive

The community standard for saving blobs is (often called "TSS Saver") or the tool shsh.host .

You can only save blobs for iOS versions that Apple is . You cannot go back in time and save blobs for iOS versions Apple has already closed. Option 1: Using BlobSaver (Recommended)