watchOS 5.1.2 (build 16S5046a) is an official Apple over-the-air update for the Apple Watch Series 3 (42mm, LTE), released on 2018-11-15T18:09:05Z. The update package is 621.99 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: 27d2bcbef53f411331915c6f150e38a59be98eee.zip.