tvOS 13.4 (build 17L5255a) is an official Apple over-the-air update for the Apple TV 4 (2015), released on 2020-03-10T17:26:23Z. The update package is 422 MB. This is a delta (partial) update that requires 13.3.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: a3da54278de1591c95197db50e96a117fe1c3ea6.zip.