watchOS 5.0 (build 16R6364) is an official Apple over-the-air update for the Apple Watch Series 1 (38mm), released on 2018-09-12T19:18:34Z. The update package is 566.95 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: cf3b49533d757be192f5dcf16db85b0010e1d6ba.zip.