watchOS 5.0 (build 16R5363a) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2018-08-31T17:15:34Z. The update package is 635.29 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: ed22162e43dc0f70f9c7174379dfd22b7b8e9edc.zip.