How to Save SHSH Blobs for Future iOS Downgrades

July 3, 20266 min read

We stated in our downgrade guide that you can only downgrade to a firmware that Apple is actively signing. But for the jailbreak community, there is a loophole: SHSH Blobs.

What is an SHSH Blob?

Whenever you install an IPSW file, Apple's server generates a unique cryptographic signature for your specific device (tied to your ECID) and that specific iOS version. This signature is the "Blob".

By saving this signature while the firmware is still being signed by Apple, you can theoretically use specialized tools (like FutureRestore) to "replay" that signature later, tricking your device into installing an unsigned IPSW.

The Catch

In modern iOS versions (iOS 16+), Apple introduced Cryptex1 and tightened SEP (Secure Enclave Processor) compatibility, which has made downgrading with SHSH blobs incredibly difficult or outright impossible for most A12+ devices. However, saving them is still considered best practice in the jailbreak community.

Step-by-Step Instructions

1. Find Your Device's ECID

Connect your device to your computer. In Finder/iTunes, click on your device's serial number until it reveals the ECID (Exclusive Chip ID). Copy this hex string.

2. Identify Your Device Identifier

Find your exact device identifier (e.g., iPhone14,5 for iPhone 13). You can use our device database for this.

3. Use a Blob Saver Tool

Navigate to a site like TSS Saver or use the desktop app 'BlobSaver'. Input your ECID and Device Identifier.

4. Download and Store

The tool will request signatures from Apple for all currently signed firmwares and save them as .shsh2 files. Keep these safe in cloud storage.

Frequently Asked Questions

Can I save blobs for a version Apple has stopped signing?

No. You can only request signatures from Apple while the signing window is open. Once it closes, it is permanently too late.

Can I use someone else's SHSH blobs?

No. Blobs are mathematically tied to your device's unique ECID. Another device's blobs are useless to you.

What is an ECID?

The Exclusive Chip ID (ECID) is a unique identifier baked into your device's processor. It is used by Apple's servers to uniquely sign firmware installations.

Do I need to be jailbroken to save blobs?

No! You can save blobs for your device at any time, even on stock iOS, by using a computer to request the signatures from Apple.

Was this guide helpful?