tvOS 13.4 (build 17L5235e) is an official Apple over-the-air update for the Apple TV 4 (2015), released on 2020-02-19T18:23:27Z. The update package is 166.61 MB. This is a delta (partial) update that requires 13.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 08c2451b18ba1021f7a41a9f1f2239be05f1a3e7.zip.