watchOS 5.1.2 (build 16S5046a) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm), released on 2018-11-15T21:18:41Z. The update package is 51.69 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: cdeea01c769b36e2b2f7cf7ef5e11fbea55c9538.zip.