Apple has stopped signing iOS & iPadOS 17.1.1 and 17.1.2, which means that iPhone and iPad users can no longer downgrade to these versions. 固定链接 'Apple stops signing iOS 17.1.1 & 17.1.2 following newer iOS 17.2 & 17.2.1 releases' 提交: December 20, 2023, 6:33am CST 由 Anthony Bouchard