How to Install Unsigned IPSW without SHSH Blobs?

If you've updated your iPhone or iPad and want to go back, you might be searching for how to downgrade iOS without SHSH Blobs. Normally, Apple only allows downgrades to versions they are still signing, and SHSH blobs are required for restoring older iOS versions. But many users wonder if there's a way around this restriction in 2025.

In this guide, we'll explain what SHSH blobs are, why Apple uses them, and what real options exist for users who want to roll back their iOS version.

Part 1: What Are SHSH Blobs and Why Do They Matter?

Before diving into how to downgrade iOS without SHSH blobs, it's important to understand what SHSH blobs actually are.

• SHSH Blobs are unique digital signatures generated by Apple's servers for your specific device and iOS version.
• They act as a verification tool to confirm that the iOS version you're installing is approved and still being signed by Apple.
• Without valid SHSH blobs, your device will usually reject attempts to install older firmware.

This means that downgrading is intentionally restricted by Apple to keep users on the latest iOS versions.

Part 2: How to Installing an Unsigned IPSW with SHSH Blobs?

Apple normally only allows you to install the latest signed iOS versions. Once signing stops for an older version, you can't restore to it unless you've previously saved your SHSH blobs. These blobs, paired with tools like FutureRestore, let you install unsigned IPSW files on your device.

Step 1: Gather the Required Files

• Unsigned IPSW – Download the version you want from a trusted IPSW repository.
• SHSH Blobs – Ensure you have blobs saved for the exact iOS version and device.
• FutureRestore – Get the most recent build from its official source.

Step 2: Prepare Your Device

• Back up your data with iTunes or iCloud (this process will erase your device).
• Ensure your battery is charged or keep the device plugged in.

Step 3: Install Dependencies

macOS: Install required libraries with Homebrew:

brew install libimobiledevice usbmuxd

Windows: Install iTunes to get the necessary device drivers.

Step 4: Organize Your Files

Place the following in the same directory:

• FutureRestore executable
• The unsigned IPSW file
• Your SHSH blob(s)

Step 5: Open a Command Line

• macOS/Linux: Open Terminal
• Windows: Open Command Prompt or PowerShell

Step 6: Run FutureRestore

Use this command format:

futurerestore -t [SHSH_BLOB_PATH] --latest-sep --latest-baseband [IPSW_PATH]

• Replace [SHSH_BLOB_PATH] with the path to your SHSH blob file.
• Replace [IPSW_PATH] with the path to your unsigned IPSW file.

Step 7: Follow the Process

FutureRestore will begin restoring your device. Your iPhone may reboot multiple times—this is normal.

Part 3: How to Install Unsigned IPSW with 3uTools?

If you want to install an unsigned iOS firmware, 3uTools makes the process more straightforward. Follow these steps carefully:

Step 1: Go to the official 3uTools website and download the latest version. Install it on your Windows PC.

Step 2: Make sure you have the correct unsigned IPSW firmware for your specific iPhone or iPad model.

Step 3: Use a USB cable to connect your device to the computer. Launch 3uTools and wait until it detects your device.

Step 4: In 3uTools, navigate to Toolbox > Backup/Restore and create a backup of your data to prevent any loss during flashing.

Step 5: Follow the on-screen instructions in 3uTools to put your device into DFU mode (Device Firmware Update mode).

Step 6: In 3uTools, go to Flash & JB > Import Firmware. Select the unsigned IPSW file you downloaded earlier. Click Flash and confirm when warned about potential risks.

Step 7: Do not disconnect your device while 3uTools is flashing the firmware. The process may take several minutes.

Step 8: Once flashing is complete, use Backup/Restore in 3uTools to bring back your saved data.

Part 2: How to Downgrade iOS Without SHSH Blobs -- TunesKit iOS System Recovery

While SHSH blobs can be used to downgrade iOS, they aren't the only solution. Tools like TunesKit iOS System Recovery provide a much simpler way to downgrade or upgrade your device—even to the latest beta—without requiring jailbreak. It's a user-friendly option for anyone who wants flexibility without the technical hassle. And it allows you to downgrade a still signed iOS version with ease!

TunesKit iOS System Recovery is a powerful repair toolkit designed to keep your iPhone or iPad running smoothly. Trusted by users worldwide, it can fix over 150 iOS system issues—including iPhone stuck in boot loop, failed updates, and frozen screens—without erasing your data. Most importantly, TunesKit also lets you downgrade iOS versions safely and easily, no jailbreaking or advanced skills required.

Here's how to downgrade iOS without SHSH Blobs using TunesKit iOS System Recovery.

Step 1 Connect Your iPhone or iPad

Download TunesKit iOS System Recovery for Windows or Mac. Install the software and launch it on your computer. Use a USB cable to connect your iOS device to the computer. Once connected, click Upgrade/Downgrade iOS. Then, select iOS Downgrade option.

Step 2Download the Firmware Package

TunesKit will automatically detect your device model. Select the iOS version you want to downgrade to (if available). Click Download to get the correct firmware package.

Step 3Start Downgrading iOS

After the firmware is verified, click Start Downgrade button to start the downgrade process. Wait until TunesKit completes the installation. Your device will restart with the older iOS version.

Part 5: FAQs about Install Unsigned IPSW

Conclusion

Installing an unsigned IPSW with 3uTools can let you downgrade iOS or restore older firmware, but it carries risks like failed flashes, data loss, or device bricking. To avoid these issues, a safer alternative is using TunesKit iOS System Recovery, which allows you to easily downgrade or upgrade iOS without SHSH blobs or jailbreaking, while also fixing over 150 system problems. Whether you choose manual IPSW flashing or TunesKit's downgrade iOS feature, always back up your device first.