On September 15, Apple officially launched the official version of iOS 27, which is compatible with iPhone 11 and subsequent models, and has further optimized the system's responsiveness. Nevertheless, numerous users who have upgraded to this version have reported encountering a critical bug in the new system. Specifically, performing certain operations that involve swiping down both the notification bar and the Control Center concurrently can result in the iPhone lagging, becoming unresponsive to touch inputs, or even freezing altogether. Apple's customer service had earlier cautioned that the initial release of iOS 27 might exhibit instability and advised against upgrading for iPhone models prior to the iPhone 13. Should users encounter battery fluctuations or performance lag, they have the option to apply for a downgrade to version 26.6.1.
