tvOS 12.1.2 (build 16K534) is an official Apple over-the-air update for the Apple TV 4 (2015), released on 2019-01-22T18:13:48Z. The update package is 978.48 MB. This is a delta (partial) update that requires 10.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: e657e342a8a3f99ad503055bc7df375a0d97259f.zip.