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 218.94 MB. This is a delta (partial) update that requires 13.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 48a3c3e240928846c0c3c51283842186fa4f88f8.zip.