watchOS 5.1.2 (build 16S46) is an official Apple over-the-air update for the Apple Watch Series 2 (38mm), released on 2018-12-06T18:03:47Z. The update package is 735.68 MB. This is a delta (partial) update that requires 4.3.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: c4b2291d2cf56168397a9ee99cd8ab5d2172547e.zip.