This tutorial is mainly introducing how to backup/download shsh using 3uTools.

What's SHSH？

SHSH is short for Signature HaSH blobs, it is also called SHSH blob. It is a term for a small piece of data that is part of Apple’s digital signature protocol for iOS restores and updates, designed to control the iOS versions that users can install on their iOS devices ( iPhone, iPads, iPod touches, and Apple TVs), generally only allowing the newest iOS version to be installable. Developers interested in iOS jailbreaking have made tools for working around this signature system in order to install jailbreakable older iOS versions that are no longer being signed by Apple.

What can we do with SHSH?

Apple will stopped the signing of old iOS version in a short time when the new firmware version is released. SHSH blobs can used to downgrade to some unsigned iOS versions. Users are recommended to back up SHSH on 3uTools regularly. 

What’s the key benefit of backuping SHSH using 3uTools?

3uTools will help back up iDevice’s SHSH to 3uTools server, so it won’t be deleted.

How to backup SHSH? 

* Download and install the latest 3uTools on PC. Launch 3uTools and then connect your iDevice to PC using the USB cable. Click Flash & Jailbreak -> Pro Flash -> Query compatible (SHSH).  

* Wait patiently, 3uTools will check and backup SHSH file automatically.

How to download SHSH?

You can find it under Flash & Jailbreak -> Advanced -> Download SHSH. 

Updated on Feb 26th: We have improved download SHSH feature on 3uTools. That means you could directly get the SHSH2 you save since Feb. 26th by clicking download SHSH.

For SHSH2 files you saved before Feb. 26th, you can find them in cache folder: Right-click 3uTools icon →Open file location, and open "cache" folder.