watchOS 1.0 (build 12S506) is an official Apple over-the-air update for the Apple Watch (42mm), released on 2015-02-25T16:44:38Z. The update package is 107.83 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: 24fabb43963f1af9d43e936d2f94991f56beb64c.zip.