iOS 9.9.13.0 (build 17A577) is an official Apple over-the-air update for the iPhone 6s, released on 2019-09-19T17:08:38Z. The update package is 2.64 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: f6002ff59eb490d59671ce029a39dc4b8b6607ec.zip.