watchOS 5.3 (build 16U5558b) is an official Apple over-the-air update for the Apple Watch Series 2 (42mm), released on 2019-06-24T17:24:50Z. The update package is 140.09 MB. This is a delta (partial) update that requires 5.2.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 0f4a1534dd1025e56f5424b9f6ebd8cd4a77deb5.zip.