watchOS 5.0 (build 16R5283r) is an official Apple over-the-air update for the Apple Watch Series 3 (42mm, LTE), released on 2018-06-11T17:07:09Z. The update package is 622.1 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: ca4ad57709144fbbd347ac00fa0e5c74713aee25.zip.