watchOS 6.0 (build 17R5521e) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2019-07-02T18:09:54Z. The update package is 687.19 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: 4421ea846b5f0b5fdd3a061b98581e904cac60fc.zip.