watchOS 5.3.5 (build 16U652) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm), released on 2020-02-18T18:07:08Z. The update package is 58.82 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: 89cf05edab2c2b7b3547b9f1c6e581046a6825a2.zip.