iOS 9.9.13.1 (build 17A6844) is an official Apple over-the-air update for the iPhone 8 (GSM), released on 2019-09-24T17:10:51Z. The update package is 2.77 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: 35e3cb476e90e81391b6ac8453dbe7d256449130.zip.