iOS 7.1 (build 11D5115d) is an official Apple over-the-air update for the iPhone 4 (GSM / 2012), released on 2013-12-13T18:21:11Z. The update package is 69.97 MB. This is a delta (partial) update that requires 7.1 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: f42464e1d98650778c72f578fca413f64cb0efbc.zip.