watchOS 5.3 (build 16U6569) is an official Apple over-the-air update for the Apple Watch Series 2 (42mm), released on 2019-07-22T17:22:20Z. The update package is 63.56 MB. This is a delta (partial) update that requires 5.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: ec8715f3afa8576b2d6bb7c3b1b9511793868937.zip.