watchOS 5.3 (build 16U5537b) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2019-05-28T17:12:39Z. The update package is 469.15 MB. This is a delta (partial) update that requires 5.1.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: e0c186d7019a52afd563a052bebec65b2da6e690.zip.