watchOS 5.3 (build 16U5569a) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm, LTE), released on 2019-07-16T17:14:30Z. The update package is 48.36 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: a9c959f6417aa0d1dcf6167c8b4cbf3233b0528d.zip.