watchOS 6.0 (build 17R5521e) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm), released on 2019-07-02T18:10:51Z. The update package is 665.87 MB. This is a delta (partial) update that requires 5.2.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 2e9ac9d1a8b186248a71affa50623b262fdc4d3a.zip.