watchOS 6.0 (build 17R5566a) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2019-08-15T17:18:04Z. The update package is 706.88 MB. This is a delta (partial) update that requires 5.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 2dff98ff22d179ca155a4a7845203ec351359ead.zip.