watchOS 5.1.1 (build 16R600) is an official Apple over-the-air update for the Apple Watch Series 2 (42mm), released on 2018-11-05T18:05:32Z. The update package is 27.15 MB. This is a delta (partial) update that requires 5.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 2f3ccb7a2288d55001f006aa54308cd7ffef2b5e.zip.