watchOS 5.0 (build 16R6364) is an official Apple over-the-air update for the Apple Watch Series 1 (42mm), released on 2018-09-12T19:18:52Z. The update package is 340.69 MB. This is a delta (partial) update that requires 5.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 6b0ae5635cbcee595a9572261f7cd8e3f59cd0a7.zip.