iOS 8.3 (build 12F70) is an official Apple over-the-air update for the iPhone 6, released on 2015-04-08T17:56:17Z. The update package is 1.37 GB. This is a delta (partial) update that requires null already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 1429e614b4bd72d3a06727cbe2eec4eef9333c3c.zip.