iOS 7.1 (build 11D5145e) is an official Apple over-the-air update for the iPhone 4 (GSM / 2012), released on 2014-02-04T17:56:29Z. The update package is 34.65 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: f21c4ea3701878210600408bde1c9956c423b08e.zip.