iOS 9.9.15.0 (build 19A346) is an official Apple over-the-air update for the iPhone 6s, released on 2021-09-20T17:14:04Z. The update package is 3.95 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: 322dd61a3b648387d60f4b4155e1422acd217437.zip.