Apple suddenly suddenly started signing older versions of iOS, which made it possible to downgrade some iPhone models to one of the iOS 10 iterations. This is reported by 9To5Mac with reference to the IPSW.ME portal.
Perhaps the incident is a malfunction in the operation of Apple's servers, but this does not negate the fact that now everyone in theory can take advantage of the chance of rolling back the operating system.
If for some reason you are not satisfied with the work of your smartphone on iOS 11, you can try to make a downgrade. Before doing this, remember to keep the operating system backup. You can download older versions of iOS, including iOS 10, on the
We draw your attention to the fact that our colleagues with iPhones.ru already
Updated : Apple stopped signing older versions of iOS.