watchOS 5.0 (build 16R5313d) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2018-07-03T17:11:33Z. The update package is 595.81 MB. This is a delta (partial) update that requires 4.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: f2e0890b1323fa13989c22c331bbfc67f59266b3.zip.