watchOS 6.0 (build 17R5507l) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm), released on 2019-06-17T17:12:31Z. The update package is 658.58 MB. This is a delta (partial) update that requires 5.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 8d598d446fa1fe4301a269243bb5f6b663963de9.zip.