iOS 9.9.12.3 (build 16F5117h) is an official Apple over-the-air update for the iPhone X (GSM), released on 2019-03-27T17:06:21Z. The update package is 2.58 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: a9d44f20cc44564cfebac7688cfc90fcddb5abf3.zip.