watchOS 5.1.2 (build 16S5046a) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2018-11-15T18:08:37Z. The update package is 408.66 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: 950a8ac94da8699252c8908e4e45cd5bd8ade23e.zip.