People who have been working with iOS jailbreaking are not strange with SHSH blobs. SHSH blob 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 (iPhones, iPads, iPod touches, and Apple TVs).
Simply put, saving SHSH blobs will make it possible for you to upgrade or downgrade to an iOS version even it is stopped being signed by Apple. Therefore, we recommend that you save your iOS new SHSH blobs (SHSH2) while they are still being signed. Once the iOS 10.3.2/10.3.1/10.3 signing window is closed, you cannot save the SHSH2 blob any more. This means you can’t downgrade to this firmware.
TinyUmbrella was used to save SHSH blob files for users to downgrade; unfortunately, this method of downgrading hasn’t worked for a few years now. In this article we will introduce a new tool TSS Saver that supports to automatically save SHSH2 blobs for signed firmware versions.
You have two ways to locate the ECID number of your device
1. Using iTunes
If your device is iPhone 6s/6s Plus or iPhone SE, you’ll also need to find the board configuration of your device. Here are the steps:
1. Download Battery Memory System Status Monitor from App Store onto the device that you want to save SHSH2 Blobs for.
2. Open this app and tap on “System” tab, check the Model number. This is the board configuration.
1. Open retsssaver.1conan.com.
2. In ECID box, select Hex if you used iTunes to find the ECID number, and Dec if you used UDID Calculator.
3. Type ECID number into the ECID text box.
4. Select your device and model number in Identifier section.
5. For iPhone 6s or newer model, a box should appear under device selection box asking for Board Configuration. Type the Board Configuration of your device into the box.
6. If you have an iPhone 7 or iPhone 7 plus, you can set the apnonce.
7. Tick I am not a robot and click the Submit button.
8. Wait for a few seconds, the tool will open a page with all your saved .shsh2 blobs for your device.
9. You can select Download ZIP option to download all your saved blobs, or save them to Google Drive, Dropbox, or OneDrive options.
You are done! TSS Saver has saved SHSH blobs for all signed firmware versions. In the future you can use Prometheus tool to upgrade or downgrade to unsigned firmware. Here we recommend you a desktop software Tenorshare iCareFone, it is an all-in-one iOS systemcare tool featuring iOS cleaner, iOS data transfer, iOS data backup and also iOS issues repairing.