watchOS 5.1.2 (build 16S46) is an official Apple over-the-air update for the Apple Watch Series 2 (38mm), released on 2018-12-06T18:03:44Z. The update package is 972.01 MB. This is a delta (partial) update that requires 3.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: c0c73c3ee171e2265d391fad6c209796df596522.zip.