watchOS 5.0.1 (build 16R381) is an official Apple over-the-air update for the Apple Watch Series 3 (42mm), released on 2018-09-27T20:08:53Z. The update package is 744.74 MB. This is a delta (partial) update that requires 4.3.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 139765bbeeff7b503182f30287f2db9028d75348.zip.