Apple released iOS 13.4 and iPadOS 13.4 with new Memoji stickers, Files app iCloud Folder Sharing, Trackpad Support for iPad and more couple of weeks back. Now it has rolled out iOS 13.4.1 and iPadOS 13.4.1 updates to fix FaceTime bug that prevented iOS and iPadOS devices from participating in FaceTime calls with devices running iOS 9.3.6 and earlier or OS X El Capitan 10.11.6 and earlier. It also fixes a bug in the settings app that could cause choosing Bluetooth from the quick actions menu on the Home screen to fail. iPadOS update also fixes flashlight issue on iPad Pro 12.9-inch (4th generation) and iPad Pro 11-inch (2nd generation). These updates are available on all eligible devices over-the-air in the Settings app. You can go to Settings > General > Software Update to check for it. iOS 13.4.1 includes bug fixes for your iPhone Fixes an issue where devices running iOS 13.4 could not participate in FaceTime calls with devices running iOS 9.3.6 and earlier or OS X El Capitan 10.11.6 and earlier Addresses a bug with the Settings app where choosing Bluetooth from the quick actions menu on the Home screen would fail iPadOS 13.4.1 includes bug fixes for your iPad ...