iOS 9.9.12.4 (build 16G77) is an official Apple over-the-air update for the iPhone XS Max (China), released on 2019-07-22T17:08:28Z. The update package is 2.65 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: 49a41b04bd2b5153acbd43cca96cc33bd77a175f.zip.