iOS 9.9.13.4.5 (build 17F5034c) is an official Apple over-the-air update for the iPhone 8 (GSM), released on 2020-03-31T17:20:19Z. The update package is 2.91 GB. This is a full OTA update that can be applied from any compatible base version. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 995c8f140387adb9607b65f2caa1f6d0fc44bc0d.zip.