watchOS 3.0 (build 14S5278d) is an official Apple over-the-air update for the Apple Watch (42mm), released on 2016-07-05T16:46:56Z. The update package is 463.57 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: 49a5c1bf64d2b9ac3c687d74423a8f26f28ecac9.zip.