iOS 7.1.2 (build 11D257) is an official Apple over-the-air update for the iPhone 4 (CDMA), released on 2014-06-30T18:00:03Z. The update package is 151.72 MB. This is a delta (partial) update that requires 7.0.4 already installed. This update is currently signed by Apple, so it can be applied from Settings › General › Software Update.

Payload file: f27ade8156694f66fa1ff144a3436906a1769013.zip.