watchOS 5.0 (build 16R5313d) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm, LTE), released on 2018-07-03T17:11:21Z. The update package is 611.3 MB. This is a delta (partial) update that requires 4.3.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 33cd74c03717fd11174d4a496650c1d1a54e6c56.zip.