watchOS 5.0 (build 16R364) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm, LTE), released on 2018-09-12T19:18:53Z. The update package is 809.22 MB. This is a delta (partial) update that requires 4.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: b07d69f351c627bb7b69c61de1c2d0acbd4a6aae.zip.