watchOS 5.0.1 (build 16R381) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm, LTE), released on 2018-09-27T20:08:38Z. The update package is 773.12 MB. This is a delta (partial) update that requires 4.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 9efdb4037b50bf226d98d1b30dc1bc1414411cf2.zip.