How to check if iOS version verification channel is deactivated?

iOS system verification is the installation "switch" of the Apple system, or a version verification licensing mechanism. Each iOS system needs to see on the iPhone that the firmware has not turned off verification before it can be activated. (After the iOS system is installed on an iOS device such as an iPhone or iPad, it is inactive by default and needs to be activated by connecting to Apple’s official activation service before it can be used.)

#With the launch of new system versions, Apple will gradually turn off system verification for older versions of iOS systems. After iOS turns off system verification, the currently used system version cannot be downgraded to an earlier version of the system. For example, Apple has closed system verification for iOS 17.1 and earlier, which means that it currently no longer officially supports the new installation or downgrading of Apple mobile phones to reinstall the iOS 17.1 system.

#How to check whether the iOS version verification channel is closed?

Method 1: Query through https://ipsw.me/ website

1. Open iPhone to browse Device, enter [ipsw.me];

2. Go down to find [Choose a product] and select the device that needs to be flashed;

3. Then select the specific iPhone model, such as iPhone 15 Pro;

4. Pull down to see the system version that can be flashed on the current device and the system version with verification turned off.

iOS17.1.1 has a green check mark, indicating that currently only the iOS17.1.1 version of the firmware can be flashed;

Both iOS17.0.2 and iOS17.0.3 are red crosses, indicating that verification has been turned off and cannot be updated;

Note: https://ipsw.me/ can be opened not only on the iPhone, but also on the computer.

Method 2: Query through the official website

Open the official website, select [Firmware] in the website navigation menu to enter the firmware After downloading the page, select [Device Model]-[Flashable Version] to view the flashable system version and the system version with verification turned off.

Similarly, a green check indicates the system version can be flashed, and a red cross indicates that the system has turned off verification.

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