watchOS 5.3.5 (build 16U652) is an official Apple over-the-air update for the Apple Watch Series 4 (40mm), released on 2020-02-18T18:07:08Z. The update package is 47.7 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: c4c8b8aa4dc964dd9837ae042457c4f875c9db1c.zip.