watchOS 1.0 (build 12S506) is an official Apple over-the-air update for the Apple Watch (42mm), released on 2015-02-25T16:44:35Z. The update package is 107.78 MB. This is a delta (partial) update that requires 8.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 739967560163d659c6ecb362ef9700f7668dc889.zip.