iOS 7.1 (build 11D5134c) is an official Apple over-the-air update for the iPhone 4 (GSM), released on 2014-01-20T17:59:25Z. The update package is 31.2 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: 9a6be9850cd2794f48713333d9eef2f4cbed6040.zip.