iOS 9.9.13.1 (build 17A5844a) is an official Apple over-the-air update for the iPhone 6s+, released on 2019-09-18T17:07:03Z. The update package is 2.79 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: 61df4281c74d4d62c42795fa8408f68b6a01ccb9.zip.