watchOS 6.1 (build 17S5059e) is an official Apple over-the-air update for the Apple Watch Series 4 (44mm, LTE), released on 2019-10-02T17:11:23Z. The update package is 263.24 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: 005acef6f16a042e5dc6a9a2e915ac1cea25f9f2.zip.