watchOS 5.0 (build 16R5313d) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2018-07-03T17:11:30Z. The update package is 607.35 MB. This is a delta (partial) update that requires 4.2.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 63ffaca5a8e3fdd9a387c5dfd239e8ef8c7a67d4.zip.