watchOS 5.1.2 (build 16S46) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm, LTE), released on 2018-12-06T18:04:27Z. The update package is 176.79 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: a05dc56649a399cb93f7ce63e6c81cbbd17d76e0.zip.