watchOS 5.0 (build 16R5349a) is an official Apple over-the-air update for the Apple Watch Series 1 (42mm), released on 2018-08-13T17:06:43Z. The update package is 490.28 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: 109fed39d9eb036ca7e6883002cebc4556404c33.zip.