watchOS 5.1.2 (build 16S6046) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2018-12-06T18:04:12Z. The update package is 76.41 MB. This is a delta (partial) update that requires 5.1.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 88d5bd7898ebd10c28e70344deb0d56d8de79472.zip.