iOS 13.3 (build 17C5038a) is an official Apple over-the-air update for the iPhone 6s, released on 2019-11-12T18:13:04Z. The update package is 332.75 MB. This is a delta (partial) update that requires 13.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 095c3207bbebcdf8366bc2ae3f434b73babfe29a.zip.