Today, Apple stopped signing up for iOS 15.2 verification for all iPhones, and if a user upgrades their phone system to the latest iOS 15.2.1 version, they can no longer downgrade to 15.2 or earlier.
Not only that, earlier today, there were also reports that Apple will completely stop iOS 14 and push iOS 15, for this behavior, Apple officially said that allowing iOS 14 from the beginning is a temporary intention, that is, a temporary grace period.
It is worth noting that some of the user feedback of upgrading the latest iOS 15.2.1 system has appeared that the key to the keyboard number key, delete key and other keys display error bugs, and some users say that the operation after the upgrade has become stuttered, and now the verification channel of the earlier version is closed, and users who use the old version of the system need to be cautious when upgrading.
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