watchOS 6.0 (build 17R5507l) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm), released on 2019-06-17T17:12:29Z. The update package is 658.64 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: 32d85add4cc2f5993934a7597a3847e4cdc1fead.zip.