watchOS 5.0 (build 16R5334f) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2018-07-30T17:09:56Z. The update package is 652.28 MB. This is a delta (partial) update that requires 4.3.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: b0c69bfa5f489d76f2b58767e2e04b85f481c6e2.zip.