How to Downgrade to Unsigned iOS with/without SHSH Blobs? [2023]


May 10, 2021 (Updated: May 23, 2023) • Filed to: Downgrade iOS

48K views, 5 min read


How to downgrade to unsigned iOS? Is it possible to downgrade unsigned IPSW without SHSH Blobs? How to install unsigned IPSW without SHSH Blobs? You will find all the answers in this article! Without further ado, let's get started!

Part 1: What is SHSH Blobs?

SHSH Blobs is a part of Apple's digital signature system, which is a piece of code and embedded in each iOS firmware for each iOS device.

When an iOS user tries to restore their device, one of the functions of SHSH Blobs is to assist Apple to determine whether a signed IPSW firmware file is being used.

Part 2: Is it Possible to Downgrade to Unsigned iOS without SHSH Blobs?

It's not possible to downgrade to an unsigned iOS version without an SHSH Blobs.

When you use iTunes to switch between two iOS versions, Apple will use iTunes to find the SHSH Blobs to determine if you are downgrading to a signed iOS firmware. If one of the firmware is no longer signed, meaning Apple has removed its signature, then the downgrade process will fail. In short, you cannot restore an unsigned version of iOS with iTunes.

To restore to an unsigned iOS version, it can only be done unofficially, such as using a third-party tool like FutureRestore. However, even if you downgrade by unofficial restore method, you still need the SHSH Blobs. Without the Blobs file, you can't downgrade to unsigned iOS.

Part 3: How to Install Unsigned IPSW with SHSH Blobs?

This section will guide you step-by-step through the process of downgrading to an unsigned iOS IPSW with a SHSH Blobs file. The prerequisite is that you must have saved the Blobs file for the iOS firmware you want to restore while it was still signed by Apple.


1. Unsigned iOS firmware you want to restore. Download it from the official Apple firmware download page.

2. The SHSH Blobs file of the destination iOS firmware. If you used TSS saver to save the Blobs while the iOS version is still being signed, download it from the Retrieve section of TSS Saver.

3. FutureRestore, a restore tool designed for Apple. Download FutureRestore from this page.

Step 1. Put an unarchived FutureRestore file, the unsigned iOS firmware, and the Blob file in one folder on your Windows or Mac Computer.

put ipsw blob file and futurestore in one folder

Step 2. Open Terminal (for Mac) or Command Line (for Windows).

Step 3. Drag the unzipped FutureRestore file into Terminal and type -t.

Step 4. Drag the Blob file into the Terminal interface and type either --latest-sep --latest-baseband or --latest-no-baseband. Use the former if your iPhone device uses a sim card or the latter if your iDevice does not support a sim card.

Step 5. Drag the final of the unsigned iOS firmware you’re restoring to into Terminal. Your screen should look like the one in the image below.

use terminal to process ipsw shsh blob and futurerestore

Step 6. Press Enter on your keyboard. Make sure your computer has an internet connection and is connected to your iOS device with a data transfer cable. Then wait the downgrade process run and complete.


Before you start to downgrade, make a full backup of your iOS device to both iTunes and iCloud. The backup will save all of your files and data, including saved passwords, game files, messages. You can easily restore them after the downgrade is done.

Part 4: How to Downgrade iOS with WooTechy iMaster?

If you want to revert to an earlier version of iOS that Apple still signed, then you have a better choice - the professional iOS downgrade tool WooTechy iMaster. It is the easiest and fastest way to downgrade iOS and can easily downgrade iPhone, iPad to any supported iOS version.

WooTechy iMaster – The Best iOS Downgrade Tool




  • Supports all iOS devices and iOS versions, including the latest iOS 16 and the upcoming iOS 17

  • User-friendly, no technical knowledge required, downgrade iOS version in just a few clicks

  • Secure downgrade and upgrade process with no risk of data loss

  • Free backup and upgrade, during which you can check compatibility

  • High success rate, easy and fast to use

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How to Downgrade iOS by WooTechy iMaster?

Step 1: Download and install WooTechy iMaster on your computer. Launch it and connect your iOS device with USB cable. Choose Downgrade iOS.

downgrade iOS

Step 2: Select the firmware version you want to downgrade, click Next to download it.

download iOS firmware

Step 3: Once the firmware is downloaded and verified, click Start to begin the downgrade process.

downgrade iOS

Step 4: When your iPhone has been downgraded successfully, click Done to finish the process.

Downgraded successfully

[Video Guide] How to Downgrade iOS?

YouTube Video

Part 5: FAQ on Downgrade Unsigned iOS

Q1: What does it mean when the IPSW file is Not Signed anymore?

An unsigned iOS (IPSW) firmware is a version of iOS that is no longer supported or signed by Apple. Such a version will not receive security or feature updates.

Q2: Can I downgrade iOS 16 to iOS 15?

Of course, using the professional iPhone downgrade software WooTechy iMaster can help you downgrade from iOS 16 to iOS 15 or even any supported iOS version in minutes.

Q3: Can I trust the online iPhone downgrade online service?

There are some unofficial iOS downgrade online services online claiming to downgrade to any unsigned iOS IPSW without using a PC. but we do not recommend you to use them. This is because such remote services may steal information from your device, or even disappear without a trace after charging a fee.


Well, now you know what SHSH Blobs is and you know how to downgrade and install unsigned IPSW with or without SHSH Blobs. It's worth emphasizing again that if you want to quickly downgrade to the original iOS version, for example, from iOS 16 to iOS 15, then you can't miss this professional iPhone upgrade and downgrade tool WooTechy iMaster!

WWDC will be held in June and the highly anticipated iOS 17 will be unveiled soon. If you encounter system failure or bugs after upgrading iOS 17 beta, you can use WooTechy iMaster to simply quickly downgrade your iPhone to any iOS version without losing data. Now this iPhone upgrade/downgrade software has also become the most popular tool for many Apple users to experience and switch between different iOS versions! Download and try it!

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