watchOS 6.0 (build 17R5507l) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2019-06-17T17:11:14Z. The update package is 663.03 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: a2143025e5c1f6adbc07a8bcf24de9861b27f45e.zip.