iOS 9.9.12.4 (build 16G6077) is an official Apple over-the-air update for the iPhone 6s, released on 2019-07-22T17:05:12Z. The update package is 2.2 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: 309d009fa10d5375ae9b8b701823d90063164802.zip.