watchOS 5.0 (build 16R5360a) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2018-08-24T17:14:23Z. The update package is 635.33 MB. This is a delta (partial) update that requires 4.2.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: e4d4669a4055712b0d6f9fcc394ab6c0b219b26d.zip.