watchOS 5.0 (build 16R5340g) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2018-08-06T17:12:09Z. The update package is 505.65 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: c03e0df8dd1f2b195a05c1937c54aab0a74821d7.zip.