Will Apple receive an upgrade prompt after returning to 15. 1 version?

After returning to the system version of iOS 15. 1, you will not be prompted to upgrade, because now Apple has closed the verification channel of the official version of iOS15. This means that if your iPhone is still in the official version of iOS65438, it has been upgraded to iOS15.

For some users who update to the latest iOS system, when they encounter major bugs, the downgrade method is sometimes very effective, which is why Apple will wait for a while before closing the verification channel of the old iOS system.

Therefore, after the downgrade, Apple closed the verification channel, which made it impossible to receive the upgrade prompt. This also means that Apple's mobile phone will not be actively upgraded in the future, and it can only be upgraded through computer channels or jailbreak.