tvOS 13.4 (build 17L6256) is an official Apple over-the-air update for the Apple TV 4 (2015), released on 2020-03-18T17:19:30Z. The update package is 1.64 GB. This is a full OTA update that can be applied from any compatible base version. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 53a26651954e9ce8b28f7ba9654264ec9eb22299.zip.