watchOS 6.1.1 (build 17S5433b) is an official Apple over-the-air update for the Apple Watch Series 4 (40mm, LTE), released on 2019-11-05T18:18:28Z. The update package is 748.87 MB. This is a delta (partial) update that requires 5.3.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: ddb5e785730428e10225e8f14fefa54dcd229077.zip.