iOS 8.4 (build 12H4125a) is an official Apple over-the-air update for the iPhone 4s, released on 2015-06-09T17:53:04Z. The update package is 119.61 MB. This is a delta (partial) update that requires 8.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: afdaaad60b18885c363ad58d9709228b3bdd4b58.zip.