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 158.09 MB. This is a delta (partial) update that requires 7.0 already installed. This update is currently signed by Apple, so it can be applied from Settings › General › Software Update.

Payload file: d52a3e7a1a2c16c8c400c6829a6d6fe6d5e00760.zip.