watchOS 6.0 (build 17R5507l) is an official Apple over-the-air update for the Apple Watch Series 1 (42mm), released on 2019-06-17T17:11:27Z. The update package is 664.7 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: d6eca92f07aad2b1acb22802800c8da3567deb15.zip.