watchOS 5.0 (build 16R5340g) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2018-08-06T17:11:49Z. The update package is 484.24 MB. This is a delta (partial) update that requires 4.3.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: eef2cf19c51c2f4ffd48408482d5f023e53d8a15.zip.