iOS 12.3 (build 16F5155a) is an official Apple over-the-air update for the iPhone 7 (GSM), released on 2019-05-07T17:04:35Z. The update package is 454.5 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: d4a636326dcb13128ea289e2a85adb77fe1c2323.zip.