watchOS 5.0 (build 16R5360a) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm, LTE), released on 2018-08-24T17:14:14Z. The update package is 374.26 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: 9010543b605a4e93fd4c2c3be962515f3d9ea8bd.zip.