watchOS 5.2 (build 16T5181f) is an official Apple over-the-air update for the Apple Watch Series 1 (42mm), released on 2019-01-24T18:07:51Z. The update package is 419.69 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: ee6dcf7a7c562c741e67534372d4123e646d7757.zip.