watchOS 5.1 (build 16R5584a) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2018-10-15T17:10:03Z. The update package is 747.99 MB. This is a delta (partial) update that requires 4.3.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 02704d6d50570e5ee6ea94ed99f1a56f10b8599f.zip.