watchOS 4.3.2 (build 15U70) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2018-07-09T17:08:05Z. The update package is 660.85 MB. This is a delta (partial) update that requires 3.2.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: ab621485e2620b7c3072fe61d03b57b0e2dc5490.zip.