tvOS 11.2.5 (build 15K552) is an official Apple over-the-air update for the Apple TV 4 (2015), released on 2018-01-23T18:10:16Z. The update package is 391.58 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: 89a503402ffdf5f90137c94a03d936b3035352a5.zip.