watchOS 5.3 (build 16U569) is an official Apple over-the-air update for the Apple Watch Series 2 (42mm), released on 2019-07-22T17:20:18Z. The update package is 1006.9 MB. This is a delta (partial) update that requires 3.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: a90c485bbbf6af4584898442ec4de2ac14b3d2f5.zip.