| Tool | Purpose | Platform | Features | |------|---------|----------|----------| | | Save SHSH blobs | Windows/Mac/Linux | GUI/CLI, auto-saving, APNonce reading | | TSS Saver | Save SHSH blobs | Web-based | Online, cloud storage integration | | Futurerestore | Downgrade with blobs | Windows/Mac/Linux | Prometheus/Odysseus methods | | Legacy iOS Kit | All-in-one | Mac/Linux preferred | Saves blobs, downgrades, SEP exploit support | | iFaith | Extract onboard SHSH | Windows | For older devices (32-bit) | | 3uTools | SHSH management | Windows | ECID reading, flash with blobs |
In the world of iOS customization and jailbreaking, few terms are as crucial—or as misunderstood—as . If you have ever wanted to downgrade your iPhone to a previous iOS version, or if you follow the jailbreak community, you have likely heard the phrase "save your 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.
Your iPhone relies on a separate, highly secure co-processor called the Secure Enclave (SEP), which handles Touch ID, Face ID, and Apple Pay data, alongside a Baseband chip for cellular connectivity. shsh blobs
When you initiate a restore, your computer extracts the iOS firmware file (.ipsw). It requests a signature from Apple’s TSS (Tuning Server) server.
Apple modified the signing protocol. Older blobs just required the ECID. Modern blobs require the (a specific nonce).
Even if you have valid SHSH blobs, downgrading may fail if: | Tool | Purpose | Platform | Features
If you update to a new iOS version that is slow or buggy, saving your blobs for the previous, more stable version allows you to downgrade back to it, provided you saved them while that version was still active. 2. Upgrading/Re-restoring for Jailbreaks
Even if you have valid SHSH blobs for an older iOS version, a successful downgrade requires compatibility with the and the Baseband (cellular firmware).
To help you get started with managing your specific device's firmware, could you share you are currently using, and what specific iOS version you are hoping to upgrade or downgrade to? AI responses may include mistakes. Learn more Share public link Apple then "signs" this request with a blob
Blobsaver is an open-source desktop application available for macOS, Windows, and Linux. It is highly recommended because it can automatically read your device information and even save blobs automatically in the background.
: Can be restored to iOS 16.6.x with SHSH blobs using Legacy iOS Kit and updated futurerestore nightly.
What is it on right now, and what version do you want to install?
When your device requests a restore, it generates a random cryptographic nonce.