watchOS 5.1.2 (build 16S5042a) is an official Apple over-the-air update for the Apple Watch Series 1 (42mm), released on 2018-11-07T21:14:46Z. The update package is 124.85 MB. This is a delta (partial) update that requires 5.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 927a53b415a8ca8f9709f3c85a420c1829bb6c7f.zip.