iOS 9.9.12.1 (build 16B5089b) is an official Apple over-the-air update for the iPhone XS, released on 2018-10-22T17:01:58Z. The update package is 2.62 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: f4f13b78e59828328c22156158b07670272889a4.zip.