watchOS 5.0 (build 16R5334f) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2018-07-30T17:09:58Z. The update package is 647.85 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: d8166ad8992707564a0afab9aeec276cdbcfbb44.zip.