iOS 12.3 (build 16F5117h) is an official Apple over-the-air update for the iPhone SE, released on 2019-03-27T17:06:28Z. The update package is 314.52 MB. This is a delta (partial) update that requires 12.2 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 82aa26b715e25403822a04f90ff104cdf56c428b.zip.