iOS 7.1 (build 11D167) is an official Apple over-the-air update for the iPhone 4 (CDMA), released on 2014-03-10T16:58:42Z. The update package is 151.3 MB. This is a delta (partial) update that requires 7.0.6 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 481f2bbb2bb014fb890a27df55b13c94cc7c5a39.zip.