tvOS 13.4 (build 17L256) is an official Apple over-the-air update for the Apple TV 4 (2015), released on 2020-03-24T17:17:22Z. The update package is 1.37 GB. This is a delta (partial) update that requires 9.2.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: c8ef58c088aee647562ea14acaa39e2edd60d92d.zip.