Apple locks the signatures of iOS 11.4.1, farewell to downgrade from iOS 12

Following the release of iOS 12.0.1, Apple has finally closed the signatures of iOS 11.4.1, therefore making it impossible to downgrade from iOS 12 to iOS 11. Before today, who had installed iOS 12 could downgrade to iOS 11.4.1, but now this is no longer possible. The decision to stop the signatures...