watchOS 5.0 (build 16R5322d) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2018-07-17T17:10:55Z. The update package is 656.92 MB. This is a delta (partial) update that requires 4.2.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: c1188cc4d5fe5230176b7e2db7e02b2e17b8762e.zip.