watchOS 5.1.2 (build 16S46) is an official Apple over-the-air update for the Apple Watch Series 2 (42mm), released on 2018-12-06T18:04:00Z. The update package is 417.74 MB. This is a delta (partial) update that requires 5.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: d17246df6e128e810b661250facdaf2432250ea7.zip.