
When bundle is "signed," it means that it has passed a server-side verification cheque that Apple performs erstwhile a caller mentation of iOS is downloaded connected an iPhone. An update can't beryllium installed unless it passes the verification check.
Unsigning bundle prevents Apple customers from installing outdated, little unafraid versions of iOS.
Apple isn't forcing users to instal ‌iOS 26‌, and determination is an enactment to proceed utilizing iOS 18, but erstwhile a instrumentality has been upgraded to ‌iOS 26‌, there's nary going back.
Apple has besides stopped signing iPadOS 18.6.2 and tvOS 18.6, truthful there's besides nary downgrade enactment disposable for iPads.
This article, "Apple Stops Signing iOS 18.6.2, iOS 26 Downgrades Now Impossible" archetypal appeared connected MacRumors.com
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