watchOS 5.1.2 (build 16S5046a) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2018-11-15T18:09:14Z. The update package is 544.04 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: 19922834068ca2eebb34de444df0e15ff81c6c14.zip.