watchOS 5.0 (build 16R5334f) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2018-07-30T17:09:54Z. The update package is 654.85 MB. This is a delta (partial) update that requires 4.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 00e5f79ea0b0826e4cb2adca37b1ff401263e7af.zip.