iOS 9.9.12.4 (build 16G77) is an official Apple over-the-air update for the iPhone 8 (GSM), released on 2019-07-22T17:08:26Z. The update package is 2.35 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: 17bb053f0455d221bd0a73fa6105b4218d036b7f.zip.