watchOS 6.0 (build 17R5521e) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm), released on 2019-07-02T18:10:52Z. The update package is 665.34 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: ec17b6a201f915f91f26ac1474b56e5f321e9a57.zip.