watchOS 5.0 (build 16R5349a) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2018-08-13T17:06:38Z. The update package is 327.26 MB. This is a delta (partial) update that requires 5.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 3c490b55e8f5af22166ebd67c4827137e26b8546.zip.