The release of iOS 14.7 has led to compatibility issues for developers using Xcode 12.4, particularly those encountering the "Unsupported OS version" error. This article delves into why this issue arises, what it entails, and possible solutions or workarounds for developers affected by this error.

Understanding the Compatibility Issue

When Apple releases a new iOS version, it ensures that Xcode, its integrated development environment (IDE), is updated to support the changes and new features of the operating system. Developers working with Xcode must keep their development environment updated to match Apple's frequent iOS releases.

Xcode 12.4 was designed to support iOS operating systems up to version 14.6. When Apple's iOS 14.7 was released, developers using Xcode 12.4 began facing compatibility issues — specifically, the "Unsupported OS version" error when attempting to deploy and test applications on devices running iOS 14.7.

Technical Explanation

The "Unsupported OS version" error occurs because Xcode relies on the Device Support files, which include information about all the available iOS SDKs and associate metadata needed for deploying apps. When iOS 14.7 was released, Xcode 12.4 could not recognize or properly interact with the updated device environment because its Device Support files were obsolete.

This is akin to a situation where a developer tries to run software based on old libraries that don't include definitions necessary for interacting with new features or architectures in a programming language.

Solving the Problem

1. Update Xcode

The most straightforward solution is to update Xcode to a version that supports iOS 14.7, such as Xcode 12.5 or newer. Updating provides access to the latest SDKs, ensuring complete compatibility with the new iOS version and future updates.

2. Manually Add Device Support Files

In situations where updating Xcode is not immediately possible due to hardware or software constraints, developers can manually add Device Support files for iOS 14.7 into their existing Xcode installation:

1. Locate someone using a compatible Xcode version that supports iOS 14.7.
2. Copy the Device Support files from their system — typically found in the path: