iOS 9.9.13.4 (build 17E5223h) is an official Apple over-the-air update for the iPhone 8 (GSM), released on 2020-02-05T18:17:26Z. The update package is 2.86 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: 4ca592774f6f21b6b981659cb9f51bd1ab346579.zip.