watchOS 1.0 (build 12S506) is an official Apple over-the-air update for the Apple Watch (38mm), released on 2015-02-25T16:44:39Z. The update package is 107.57 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: 651871c719d9192693a3c9a866edae880bb40dd4.zip.