watchOS 6.1 (build 17S5076a) is an official Apple over-the-air update for the Apple Watch Series 3 (42mm, LTE), released on 2019-10-16T17:13:04Z. The update package is 540.78 MB. This is a delta (partial) update that requires 6.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 064e866d272c922ac1b0692904399f403f918e9e.zip.