watchOS 5.3 (build 16U5558b) is an official Apple over-the-air update for the Apple Watch Series 2 (42mm), released on 2019-06-24T17:24:51Z. The update package is 97.49 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: ee20cc2e52e2aaa3e1bc76c49c64b2e60bc2b7a3.zip.