iOS 9.9.13.1 (build 17A5837a) is an official Apple over-the-air update for the iPhone XS Max, released on 2019-09-10T20:25:19Z. The update package is 3.25 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: fcfa3519cb8df1f2e1342812b9b2e32a5f35e47b.zip.