If you don't want your iOS device to update automatically, you'll need to downgrade to an unsigned iOS System. This thing prevents your system from installing new iOS updates as new iOS versions can contain bugs that can be harmful to your device. Unfortunately, you won't find any official method to get your job done. However, you can read this guide to find out how to downgrade to unsigned iOS
Since you may find installing unsigned iOS difficult via iTunes, we'll show you the unique way to get your job done. Apart from this, we'll also you about the software that can fix your iOS device issues.
Part 1. Why do people want to downgrade to an unsigned iOS version?
Every latest iOS version comes with a signature. A signature that comes with an Apple update is nothing but a piece of code. You'll be able to add a signature to your iOS version by installing a new iOS version via iTunes. The sign from an Apple update will be deleted after two weeks. It means you can downgrade or upgrade to any iOS version until the iOS version carries a signature. You won't be able to downgrade or upgrade to any iOS update if the signature gets deleted after two weeks or so.
In this way, Apple makes jailbreaking software and iOS device fairly difficult. However, you can still downgrade to unsigned iOS using a few methods. However, you can't get it done officially. People want to downgrade to unsigned IPSW for allowing them to move to a stable iOS system, so they don't have to install a new iOS update whenever it comes.
- View also: How to Restore IPSW on iPhone/iPad 
Part 2: How to downgrade to unsigned iOS without iTunes?
If you want to downgrade iOS to unsigned version without iTunes, you'll need to follow the steps below. However, you need to meet certain requirements before installing an unsigned iOS.
Step 1: Acquire the right SHSH Blobs
After connecting your iOS device to a PC, you'll need to launch iTunes and then hit the Summary icon. Now, you'll need to copy the ECID after clicking the Serial Number field. After copying it, you'll need to paste your Notepad document. Then, you'll need to perform the same task for the Device Identifier and navigate to TTS Saver. Select the device type after pasting the ECID into your designated field. Later, you'll only need to hit the Submit button after pasting the Device Identifier.
Step 2: Preparations before downgrading to Unsigned iOS
First of all, you'll need to install NonceSet 1112 on your PC. Now, you can install the futurerestore after downloading the iPhone iOS firmware.
Note: You'll need to ensure your device has at least 9 to 10GB of free space.
Step 3: Install unsigned iOS Firmware
1) In this phase, you'll need to create a folder and name it futurerestore on your computer. Later, all you need to do is unzip your futurerestore file there. Your folder should look like c:/futurerestore. Now, you'll only need to copy the SHSH2 and IPSW into this folder. Moreover, if you want to write your command line pretty easily, you can try changing the names of your files.
2) Locate your generator key string after launching the SHSH2 blobs in your Notepad. After finding the generator key string, you'll need to enter it in your PhoenixNonce app. Later, you'll need to hit the SET button to confirm the changes you've made. Next, your iPhone device might get restarted again, so you'll need to be a bit patient for some time.
3) After launching the app again, you'll need to ensure the key string you've found is correct. You should make sure you haven't launched iTunes, or else you won't be able to download to unsigned iOS without iTunes. Next, you'll need to connect your iPhone to a PC and ensure both devices use the same Wi-Fi network.
4) In this phase, you'll only need to access the computer's operating system as an administrator. Later, you'll need to enter the command line futurerestore -t my.hsh2 -i signed.ipsw restoreto.ipsw after launching the Command Prompt.
5) After entering the command line, you'll need to hit the Enter icon, and after this, the process of downgrading to unsigned iOS will start occurring. You need to wait for a few minutes before it gets completed.
Part 3. Recommended iOS fixing program - TunesKit iOS System Recovery
If you're facing an iOS issue, you don't need to worry. Instead, you need to take the services of TunesKit iOS System Recovery. Surprisingly, this tool can help get rid of 150+ software issues. It is a pretty incredible third party that has set high standards.
Moreover, solving your iPhone issues is pretty straightforward as you'll only need to follow a few guidelines to get your job done. Luckily, using TunesKit iOS System Recovery, you've also got the luxury to repair your device with no data loss. However, for this, you'll need to select the Standard Mode to put the things in order.
Characteristics of TunesKit iOS System Recovery:
- Fix iOS issues like iPhone stuck on update requested without data loss
- Repair different tvOS/iOS issues at home
- Provide Standard Mode and Advanced Mode
- Easy to use with intuitive interface
- Supports the latest iOS version including 15
Here's the guide to repairing your device.
Step 1: In the first phase, you'll only need to visit the official TunesKit iOS System Recovery website and download the latest version of this application. After installing it on your Windows or Desktop computer, you'll need to launch the software. Moreover, you'll also need to connect iPhone to your PC.
Step 2: Now, if you don't want to lose any important information on your iPhone, select the Standard Mode option from the TunesKit iOS System Recovery tool's interface.
Step 3: After hitting the Standard Mode icon, you'll need to get the latest version of the Firmware Package downloaded.
Now, all you need to do is press the Repair button and allow the software to restore your device. After having your job done, you need to see how this method goes for you.
Downgrading to an unsigned iOS version isn't easy as you haven't got any official method to serve your purpose. Moreover, you can lose your important data in the process. However, after reading this guide, you'll figure out how to downgrade to unsigned iOS. Since you can't downgrade to unsigned iOS without iTunes, we've explored the best method to put your things in order.
If you face an iOS device issue during the downgrading to unsigned iOS process, you can take the services of TunesKit iOS System Recovery. It is a prestigious third-party tool that allows you to get rid of many iOS device issues.