watchOS 6.0 (build 17R5566a) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm, LTE), released on 2019-08-15T17:17:21Z. The update package is 824.54 MB. This is a delta (partial) update that requires 5.1.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: a3dae883857a859ef6d7247cd01104fbf0fe0e92.zip.