watchOS 5.3 (build 16U569) is an official Apple over-the-air update for the Apple Watch Series 2 (42mm), released on 2019-07-22T17:21:37Z. The update package is 137.26 MB. This is a delta (partial) update that requires 5.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 53339368eee1faab6857eb3fca33986fe6cb5b84.zip.