Apple today released iOS and iPadOS 13.4.1, minor updates that come two weeks after the release of iOS and iPadOS 13.4, major updates that introduced iCloud Folder Sharing, a new Mail toolbar, trackpad support for the iPad, and more.

The iOS and ‌‌iPadOS‌‌ 13.4.1 updates are available on all eligible devices over-the-air in the Settings app. To access the updates, go to Settings > General > Software Update.

The update addresses an issue  that prevented devices running iOS 13.4 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.

Discovered shortly after the release of iOS 13.4 and macOS 10.15.4, the ‌FaceTime‌ issue prevented iPhones, iPads, and Macs running these updates from making or receiving ‌FaceTime‌ calls from older devices that aren't able to upgrade, such as the ‌iPad‌ 2, third-generation ‌iPad‌, iPhone 4S, the first-generation ‌iPad‌ mini, and the fifth-generation iPod touch.

It wasn't clear if the problem was caused by a bug or was intentional, but the fix included in today's update clarifies that Apple did not mean to remove the option for devices running iOS 13.4 to communicate with older devices. Full release notes for the iOS 13.4.1 update are below:

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 a Bluetooth from the quick actions menu on the Home screen would fail. 

The ‌iPadOS‌ 13.4.1 update fixes the same two issues, but also addresses a third bug that could cause the flashlight not to turn on on the new 11 and 12.9-inch iPad Pro models after the Flashlight button in Control Center or the Lock screen is tapped.