watchOS 6.0 (build 17R5521e) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2019-07-02T18:09:56Z. The update package is 671.36 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: b31cfcc8a8db2674714b1d434105c8a8e76a282e.zip.