watchOS 5.0 (build 16R5340g) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm, LTE), released on 2018-08-06T17:11:57Z. The update package is 533.26 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: 96350208efb05d4465e59a9fcdf90e537f84ce31.zip.