iOS 9.3.3 (build 13G21) is an official Apple over-the-air update for the iPhone 4s, released on 2016-06-06T16:47:06Z. The update package is 30.31 MB. This is a delta (partial) update that requires 9.3.3 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: bd74b1e117d2e41863f623fdc4af1c42f11881cf.zip.