tvOS 11.2.5 (build 15K5552a) is an official Apple over-the-air update for the Apple TV 4 (2015), released on 2018-01-17T18:08:18Z. The update package is 19.7 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: 46d7849319c959477d3fbc5cec66acc0eedf1db7.zip.