iOS 12.3 (build 16F5148a) is an official Apple over-the-air update for the iPhone SE, released on 2019-04-29T17:36:15Z. The update package is 394.85 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: 2cb908afb8e1d6aaf33993d1f9f7594ee2369e50.zip.