tvOS 11.2.5 (build 15K5539b) is an official Apple over-the-air update for the Apple TV 4K, released on 2017-12-20T18:08:00Z. The update package is 57.01 MB. This is a delta (partial) update that requires 11.2.5 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: efe566c1720d93e13bdcc815c415c1efcddedf69.zip.