iOS 12.4 (build 16G5077a) is an official Apple over-the-air update for the iPhone SE, released on 2019-07-16T17:39:43Z. The update package is 143.74 MB. This is a delta (partial) update that requires 12.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 9f24f5334886682a647ba870dbdc5522574bd70d.zip.