watchOS 6.1 (build 17S5076a) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm), released on 2019-10-16T17:13:43Z. The update package is 263.72 MB. This is a delta (partial) update that requires 6.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 59ce1737114d22b4a7bce600793e93fa132d78f0.zip.