watchOS 5.3.5 (build 16U652) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm), released on 2020-02-18T18:07:06Z. The update package is 54.84 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: 88ad7c350c36c216d7d30154f7370d93ee63a116.zip.