watchOS 3.0 (build 14S5315a) is an official Apple over-the-air update for the Apple Watch (42mm), released on 2016-08-09T16:45:40Z. The update package is 556.48 MB. This is a delta (partial) update that requires 2.2.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 15d0c4ba860d2dd15870965459fbeb3da7166a56.zip.