watchOS 5.2 (build 16T5191d) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2019-02-04T18:13:40Z. The update package is 423.64 MB. This is a delta (partial) update that requires 5.1.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 6dd83fa0053587a4830f19da2cc7d300e15cb314.zip.