iOS 9.9.13.1 (build 17A5821e) is an official Apple over-the-air update for the iPhone 6s+, released on 2019-08-27T17:29:31Z. The update package is 2.75 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: a4f8345f9c4e51b2278089e66befb257cc2b1409.zip.