iPadOS 12.3 (build 16F5148a) is an official Apple over-the-air update for the iPad mini 3 (WiFi), released on 2019-04-29T17:35:29Z. The update package is 370.61 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: d6dac25cdbc9b71bf435238a1c8cbca937899335.zip.