iOS 9.9.13.0 (build 17A6577) is an official Apple over-the-air update for the iPhone XS Max, released on 2019-09-19T17:07:56Z. The update package is 3.28 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: afecd6489ab5da982b9bbfcca4d6ef17f28e56ae.zip.