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 145.67 MB. This is a delta (partial) update that requires 5.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: f4309aa35bf02f0a4c0e97a820a7765a86fdefd6.zip.