watchOS 5.1.1 (build 16R6600) is an official Apple over-the-air update for the Apple Watch Series 2 (38mm), released on 2018-11-05T18:05:14Z. The update package is 394.78 MB. This is a delta (partial) update that requires 5.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 1eb65d08cac64115f11d9fd1540f67c5d2e2ad04.zip.