watchOS 5.3 (build 16U5537b) is an official Apple over-the-air update for the Apple Watch Series 2 (38mm), released on 2019-05-28T17:12:02Z. The update package is 95.33 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: b41b423e8d2025a1d916677637ee0789a1fd0774.zip.