watchOS 5.3 (build 16U5566a) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2019-07-09T17:19:54Z. The update package is 148.2 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: e5a658a33a1c7898b3247d6b09ab9c0bce045fa6.zip.