watchOS 5.1.2 (build 16S5042a) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2018-11-07T21:15:04Z. The update package is 423.41 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: 5f445e7a779df5f0f2c8324bb256389a3353b11a.zip.