watchOS 5.3.5 (build 16U652) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm, LTE), released on 2020-02-18T18:07:02Z. The update package is 59.26 MB. This is a delta (partial) update that requires 5.3.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 97e0969039dbf7ddd38041477dba9899558001a9.zip.