iOS 9.9.12.1.4 (build 16D57) is an official Apple over-the-air update for the iPhone X (GSM), released on 2019-02-07T18:06:41Z. The update package is 2.55 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: ec301c550ef834d82a808779623c3bd593c7f0e1.zip.