watchOS 5.3 (build 16U5526f) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm, LTE), released on 2019-05-15T17:11:35Z. The update package is 168.51 MB. This is a delta (partial) update that requires 5.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 555d8ff0aac85db4170789036e2c429e2ef7e674.zip.