tvOS 11.2.5 (build 15K552) is an official Apple over-the-air update for the Apple TV 4K, released on 2018-01-23T18:10:16Z. The update package is 533.61 MB. This is a delta (partial) update that requires 11.2.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 6f183953f00f75a887c7ac11276fea5d4fe08775.zip.