watchOS 6.3 (build 17U6208) is an official Apple over-the-air update for the Apple Watch Series 2 (42mm), released on 2020-12-14T18:08:41Z. The update package is 122.09 MB. This is a delta (partial) update that requires 6.2.8 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: e1409c1e7e29ec636be0b3d7e29e210aa82b60a7.zip.