Apple released iOS 13.4.1 to the public today, Tuesday, April 7, at 10 a.m. PDT. This update comes exactly two weeks after the release of iOS 13.4, which introduced 33 new features and changes to compatible iPhones.
According to Apple, this update fixes two bugs in particular. First, fixes a FaceTime issue where devices with iOS 13.4 couldn't jump into calls with older devices with iOS 9.3.6 and earlier or with macOS X El Capitan 10.11.6 and earlier. Second, fixes a bug where the selection of "Bluetooth" from the quick action menu of the Settings app failed.
Apple's release strategy for iOS has recently deviated from its typical path. The company released the first beta for iOS 1
The release notes for iOS 13.4.1 can be found below:  iOS 13.4.1
- Resolves an issue where devices with iPadOS 13.4 do not respond to FaceTime calls with devices with iOS 9.3.6 and earlier or OS X El Capitan 10.11.6 and earlier could participate.
- Addresses an issue on the iPad Pro 12.9-inch (4th generation) and iPad Pro 11-inch (2nd generation) where the flashlight may not turn on after tapping the flashlight button in the Control Center or on the lock screen turns on
- Fixes a bug in the Settings app when you select Bluetooth from the quick action menu on the home screen fails.
To update to iOS 13.4.1, open the Settings app on your iPhone and tap "General" -> "Software update". Follow the on-screen instructions to download the software to your device, and then continue with the update. You can also simply wait for it to be installed automatically if you have activated "Automatic updates".
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