tvOS 12.1.2 (build 16K5524a) is an official Apple over-the-air update for the Apple TV 4 (2015), released on 2018-12-10T18:19:19Z. The update package is 58.64 MB. This is a delta (partial) update that requires 12.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 9167e1f102da6ab8b1f7dd7cf31716c0e76cd0ee.zip.