Apple stops signing iOS 17.2.1, upgraded users cannot downgrade

On January 31, Apple issued an announcement today, announcing that it would stop signing iOS 17.2.1 updates and prevent upgraded users from downgrading to this version.

Note: Apple released the iOS 17.2.1 update on January 22, build number: 21C66. Apple wrote in the update log: "This update contains important bug fixes and Addresses an issue where the battery drains faster than expected in some cases.” Encourage users to update their operating systems in a timely manner and prevent users from downgrading to older, less secure iPhone operating systems. In addition to iOS 17.2.1, Apple has also discontinued iPadOS 17.2 for iPad. In addition, Apple has also stopped signing the previous versions of iOS/iPadOS 15.8 and 16.7.4 for devices that cannot be upgraded to iOS 17. Related reading: "Apple iOS 17.2.1 official version released: fixes the problem of excessive power consumption in certain scenarios"

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