watchOS 6.0 (build 17R5507l) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2019-06-17T17:11:11Z. The update package is 664.67 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: 3122063084a98ca8b846e158525f71f1ae72aa9a.zip.