watchOS 6.0 (build 17R575) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm, LTE), released on 2019-09-11T18:36:44Z. The update package is 819.72 MB. This is a delta (partial) update that requires 5.1.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: e026cdc0f1a560b494986bdaae431418fafbe9a7.zip.