watchOS 5.3 (build 16U5558b) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2019-06-24T17:25:17Z. The update package is 115.03 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: bb810cf438bf0676a41e9db882e1594e5d26bde8.zip.