Apple Stops Signing iOS 18.3.1 - 3uTools

NEWS

Apple Stops Signing iOS 18.3.1

03/19/2025

813

Apple Stops Signing iOS 18.3.1

Apple today stopped signing iOS 18.3.1, so iPhone users who have upgraded to iOS 18.3.2 are no longer able to downgrade to the prior version of iOS 18. Apple released iOS 18.3.2 on March 10.

It is not unusual for Apple to stop signing older versions of iOS after releasing an update. Software that is not signed cannot be installed on an ‌iPhone‌ due to a server-side verification check, and it keeps ‌iPhone‌ users from installing outdated versions of iOS. ‌iPhone‌ models compatible with ‌iOS 18‌ are only eligible to download and run iOS 18.3.2 at this time.

By preventing customers from installing older versions of iOS or downgrading, Apple ensures that devices have the latest security improvements.

iOS 18.3.2 introduced important security fixes, addressing a vulnerability that may have been actively exploited.

Source: Macrumors

Connect with us

About Us Legal Statement Disclaimer

© 2010 - 2025 3uTools. All Rights Reserved.

3uTools lets you manage, customize, and enhance your iPhone or iPad with ease

An All-in-one Tool for iOS Devices

Windows

Mac OS

iOS

Linux

3uTools

Win 64-bit For this device

V9.0 2025-11-11

Win 32-bit For this device

V9.0 2025-11-11

3uTools

Intel Chip How to Identify Chip Type

V9.0 2025-12-02

Apple Silicon

V9.0 2025-12-02

How to Identify Chip Type

1. Click the Apple icon in the top-left corner of the screen and select About This Mac.

2. Check the Processor or Chip field to determine if it is "Intel" or "Apple".

Please use the 3uTools PC client to install the iOS client:

1、 Install either the Windows or Mac version of 3uTools on your computer

2、 Open the PC client and connect your device to the computer via USB cable

3、 After the connection is successful, wait for the computer to automatically install the mobile app for the device, or locate “Install Mobile App” on the computer and manually click to install.

3uTools

deb file

V3.01 2025-11-20

rpm file

V3.01 2025-11-20

Windows

iOS

Android

TV

3uAirPlayer

Win 64-bit For this device

V6.0.2 2025-11-19

Win 32-bit For this device

V6.0.2 2025-11-19

iOS Device Mirroring (No App Required)

1、 Install 3uAirPlayer on the Windows PC

2、 Open Control Center and select Screen Mirroring

3、 From the list, choose your PC to start mirroring

4、 Or connect your iOS device to the PC via USB to begin mirroring

Scan to get "3uAirPlayer" App

3uAirPlayer TV V1.0.18

2025-11-28

TV System Requirements: Android 7.0 or later

Download the TV installation package, copy it to a USB drive, insert it into your TV or set-top box, then select the file from the home screen to install.