watchOS 5.2.1 (build 16U5101c) is an official Apple over-the-air update for the Apple Watch Series 4 (40mm, LTE), released on 2019-04-22T17:13:34Z. The update package is 133.93 MB. This is a delta (partial) update that requires 5.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 6632d662dd49dc100c46dc2623119a0ebefea125.zip.