iOS 9.9.16.3.1 (build 20D67) is an official Apple over-the-air update for the iPhone 8 Plus (GSM), released on 2023-02-13T18:24:44Z. The update package is 4.31 GB. This is a delta (partial) update that requires 11.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 7c983e7dfcf09909e04cbe94af75bf56fb38a0a6.zip.