Apple shared iOS 15 usage data with developers, which showed that fewer people used iOS 15 than those who upgraded to iOS 14 last year. It is estimated that this is because when Apple released iOS 15 in WWDC 2021, it stated that iOS 14 would still receive important security updates, so for some users, they did not urgently upgrade to iOS 15.
Recently, some iOS 14.x users have discovered that they cannot upgrade to iOS 14.8.1 through OTA and must upgrade to iOS 15 instead. They do not intend to keep users on iOS 14 forever, and improving security updates for iOS 14 users is only a "temporary" option. This statement has changed from WWDC 2021.
Today, Apple stated on its official support website that it will provide important security updates for devices running iOS 14.5 and iPadOS 14.5 or above "over a period of time." That's the first indication that updates are not permanently available.
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