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 22.25 MB. This is a delta (partial) update that requires 7.1.1 already installed. This update is currently signed by Apple, so it can be applied from Settings › General › Software Update.

Payload file: aac45818d54426320a8a432a322b582508cdc8cd.zip.