watchOS 6.0 (build 17R5521e) is an official Apple over-the-air update for the Apple Watch Series 3 (42mm, LTE), released on 2019-07-02T18:10:21Z. The update package is 726.85 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: 24e10e544b59070a4eeb0ed28eb912a8d66a4c13.zip.