On April 1, Apple released the iOS 15.4.1 upgrade patch, and the iPad, Mac, Apple Watch and Apple TV, and HomePod also ushered in the system upgrade.
Let's start with iOS 15.4.1, which contains bug fixes and security updates for the iPhone, and is recommended for all users to upgrade. The compilation number for iOS 15.4.1 is 19L452. A few weeks ago, Apple released iOS 15.4, which added the support for Face ID unlocking when wearing masks, as well as a new Emoji emoji.
iOS 15.4.1 includes the following bug fixes for iPhone: After updating to iOS 15.4, the battery may drain faster than expected; Braille devices may not respond when navigating text or displaying reminders; Made for iPhone hearing devices may be disconnected in some third-party apps.
In addition, iOS 15.4.1 and iPadOS 15.4.1 also fix an issue with Apple AVD that could allow apps to execute arbitrary code with kernel privileges. Apple said the vulnerability could have been widely exploited, so it wants all users to update the new system as soon as possible.
It is worth mentioning that this update was released about two weeks after the release of the new iPhone SE and iOS 15.4, which may be the last major feature update before iOS 16. iOS 15.4 enabled users to use Face ID while wearing masks, introduced gender-neutral American English voice for Siri, and added tons of new emojis, among others.
Apple also released iPadOS 15.4.1, watchOS 8.5.1 and tvOS 15.4.1 today, which are also bug fixes and security updates, but they also add support for the Apple Business Essentials program. Apple calls Business Essentials "a complete subscription that seamlessly combines device management, 24 x 7 support, and cloud storage."
Let's take a look at macOS Monterey 12.3.1, a minor update after the macOS Monterey operating system, which was launched last October. MacOS Monterey 12.3.1 was introduced two weeks after the launch of macOS Monterey 12.3, and the last update brought important universal control features.
The macOS Monterey 12.3.1 update can be downloaded on all eligible Macs through the Software Update section of System Preferences.
According to Apple's release notes, macOS Monterey 12.3.1 introduces a fix that could cause Bluetooth controllers such as gamepads to disconnect from your Mac after playing audio through certain Beats headphones. It also addresses a bug that could cause USB-C or Thunderbolt external displays to fail to turn on when connected to a 2018 Mac mini as a secondary display.
The update fixes an issue where USB-C or Thunderbolt external monitors won't turn on when connected to a Mac mini (2018) as a second display; Bluetooth devices, such as game controllers, may disconnect from your Mac after playing audio through some Beats headsets.