iOS 13.3.1 (build 17D5044a) is an official Apple over-the-air update for the iPhone 11, released on 2020-01-14T18:21:07Z. The update package is 251.82 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: dd8ab98fff6b27ed6eaf75708ad2a26ce469016c.zip.