Apple is today releasing iOS 11.4.1, watchOS 4.3.2, and tvOS 11.4.1 to the public. iOS 11.4.1 comes more than a month after the release of iOS 11.4, a major update that introduced support for Messages in iCloud and AirPlay 2.
iOS 11.4.1 is available on all eligible devices over-the-air in the Settings app. To access the update, go to Settings --> General --> Software Update. Eligible devices include the iPhone 5s and later, the iPad mini 2 and later, the iPad Air and later, and the 6th-generation iPod touch.
iOS 11.4.1 is a minor update that's been introduced to address bugs that have been discovered since the launch of iOS 11.4, with no new features discovered during the beta testing period. According to Apple's release notes, today's update fixes an issue that prevented some users from viewing the last known location of their AirPods in Find My iPhone and it improves the reliability of syncing mail, contacts, and notes with Exchange accounts.
iOS 11.4.1 also includes USB Restricted Mode, which was first introduced in the iOS 12 beta. USB Restricted Mode is designed to make your iPhone and iPad immune to certain hacking techniques used by law enforcement or other potentially malicious entities to gain access to an iOS device.
There are some iPhone access methods that use a USB connection, downloading data from your iPhone (or iPad) through the Lightning connector to crack the passcode. iOS 12 prevents this by disabling data access to the Lightning port if it's been more than an hour since your iOS device was last unlocked.
iOS 11.4.1 is mainly a bug fix release, with improved reliability of Find My AirPods, and syncing with mail, contacts, and notes with Exchange accounts.
As for watchOS, Apple’s release notes are vague, noting that “this update includes improvements and bug fixes.”
Apple today also released 11.4.1 for the HomePod as well. Learn more about that here.
iOS 12, tvOS 12, watchOS 5, and macOS 10.14 Mojave are currently in beta. Those are expected to release to the public this fall.