iPhone, iPad, and iPod touch owners who have upgraded to iOS 11.2.5 will no longer be able to downgrade to earlier versions of iOS.
Apple routinely stops signing older versions of software updates after new releases come out in order to encourage customers to keep their operating systems up to date.
iOS 11.2.5 is now the only version of iOS 11 that can be installed on iOS devices by the general public, but developers and public beta testers can download iOS 11.3, an update that is being beta tested ahead of a spring release.
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