watchOS 6.1 (build 17S5059e) is an official Apple over-the-air update for the Apple Watch Series 3 (38mm, LTE), released on 2019-10-02T17:10:10Z. The update package is 741.24 MB. This is a delta (partial) update that requires 5.2.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: e01621ba4b50e29030aa960832d9436ab3494974.zip.