iOS 9.9.13.5 (build 17F5054h) is an official Apple over-the-air update for the iPhone 6s, released on 2020-04-29T17:07:27Z. 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: 200f4a027956ecbc4fec8f16ed5b2a9e7f6a1443.zip.