cydia shsh（iOS设备的固件备份和恢复工具）

Cydia SHSH: iOS Device's Firmware Backup and Restore Tool

Introduction:

In the world of iOS jailbreaking, Cydia has always played a significant role. It not only provides a platform for users to download and install various tweaks and apps but also offers essential tools for advanced users. One such tool is Cydia SHSH, which allows users to backup and restore their device's firmware. In this article, we will explore the features and functionalities of Cydia SHSH and provide a step-by-step guide on how to use it effectively.

1. What is Cydia SHSH?

Cydia SHSH is a tool designed for iOS devices that allows users to backup and restore their device's firmware. SHSH stands for Signature HaSH, which is a unique identifier generated by Apple for each firmware version. By saving these signatures, users can downgrade or restore their devices to a specific firmware version, even if Apple has stopped signing it.

2. Why is SHSH important?

Having SHSH blobs saved for your device is essential for several reasons. Firstly, it enables you to downgrade your device's firmware to a previous version. This can be useful if you encounter compatibility issues with a new firmware or if you prefer the features of an older version. Secondly, it allows you to restore your device to a specific firmware version, even if Apple has stopped signing it. This can be beneficial if you need to repair your device or if you want to preserve a jailbreakable firmware version.

3. How to save SHSH blobs using Cydia?

Saving SHSH blobs using Cydia is a straightforward process. Here's a step-by-step guide on how to do it:

Step 1: Ensure that your device is jailbroken and has Cydia installed.

Step 2: Launch Cydia and go to the "Sources" tab.

Step 3: Tap on "Edit" and then "Add" to add a new source.

Step 4: Enter the following URL: "http://cydia.saurik.com/" and tap on "Add Source."

Step 5: Once the source is added, go to the "Search" tab and search for "TinyUmbrella."

Step 6: Install TinyUmbrella and open it.

Step 7: Connect your iOS device to your computer.

Step 8: In TinyUmbrella, click on "Save SHSH" to start saving the blobs.

Step 9: Wait for the process to complete, and the SHSH blobs will be saved to your computer.

4. How to restore or downgrade using SHSH blobs?

Restoring or downgrading your device using SHSH blobs is a bit more complicated than saving them. Here's how you can do it:

Step 1: Download the firmware IPSW file for the version you want to restore or downgrade to.

Step 2: Connect your iOS device to your computer.

Step 3: Launch iTunes and put your device into DFU (Device Firmware Upgrade) mode. The method to enter DFU mode varies depending on the device model, so make sure to follow the correct steps.

Step 4: Once your device is in DFU mode, open TinyUmbrella on your computer.

Step 5: Click on "Start TSS Server" in TinyUmbrella.

Step 6: Open iTunes and select your device.

Step 7: Hold down the Shift key (Windows) or Option key (Mac) and click on the "Restore iPhone" button.

Step 8: Browse and select the firmware IPSW file you downloaded earlier.

Step 9: Follow the on-screen instructions in iTunes to complete the restore or downgrade process.

Conclusion:

Cydia SHSH is a powerful tool that allows iOS users to backup and restore their device's firmware. By saving SHSH blobs, users can downgrade or restore their devices to specific firmware versions, even if Apple has stopped signing them. This can be beneficial for various reasons, such as compatibility issues, device repairs, or preserving a jailbreakable firmware version. By following the step-by-step guide provided in this article, users can effectively use Cydia SHSH to manage their device's firmware. So, if you are an advanced iOS user looking for more control over your device's firmware, give Cydia SHSH a try!