watchOS 5.3.5 (build 16U652) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2020-02-18T18:07:05Z. The update package is 70.07 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: a8a87a0c2b3edf8e667fdbb01a811a7282633811.zip.