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 672.91 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: 812b0cf08a536fd61abde68cbd9469ec5e92b422.zip.