watchOS 5.1.1 (build 16R6600) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm, LTE), released on 2018-11-05T18:06:13Z. The update package is 87.55 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: 5bfb6dd898e26b96dbcddeba6e206c00c89e7773.zip.