watchOS 5.1.2 (build 16S5042a) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm, LTE), released on 2018-11-07T21:15:28Z. The update package is 160.17 MB. This is a delta (partial) update that requires 5.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: eb473cfc60dfb330d5595498c2286d9e79c8cc9c.zip.