watchOS 5.1.2 (build 16S5046a) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2018-11-15T18:09:11Z. The update package is 749.94 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: 7f3eae46186d0a7f4d22b5105909fb2c99e5137f.zip.