iOS 12.3 (build 16F5139e) is an official Apple over-the-air update for the iPhone X (GSM), released on 2019-04-22T17:08:52Z. The update package is 366.54 MB. This is a delta (partial) update that requires 12.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: bf7666d2f675b9d2fdeefabd777c45cc556b6001.zip.