iOS 9.9.13.3 (build 17C6054) is an official Apple over-the-air update for the iPhone 6s, released on 2019-12-10T18:12:38Z. The update package is 2.68 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: a0519d1c9bf3ada7e50275b8ec19d96162e34728.zip.