After releasing the official version of iOS 15.6 last week, Apple today stopped the verification of iOS 15.5. This means that users who updated to iOS 15.6 can no longer downgrade to iOS 15.5. iOS 15.6 fixes an issue where Settings might keep showing full storage even when the device still has storage available, and Safari tabs might revert to the previous page.
Apple usually stops the verification of older versions of iOS within a few weeks after pushing the official version update. For some users who have updated to the latest iOS system, when they encounter major bugs, the downgrade method can sometimes be very effective.
That’s why Apple waits a while before closing the authentication channel for older versions of iOS. The previously released iOS 15.5 includes enhancements for Apple Podcasts and other features and bug fixes, as well as a baseband upgrade to 1.61.00 to improve iPhone signal performance.
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