tvOS 13.4 (build 17L5225g) is an official Apple over-the-air update for the Apple TV 4 (2015), released on 2020-02-05T18:19:25Z. The update package is 408.61 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: 526517a13480b8238accf7082bf70fee481b7f2d.zip.