iOS 9.3.3 (build 13G21) is an official Apple over-the-air update for the iPhone 6s, released on 2016-06-06T16:47:17Z. The update package is 47.89 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: 29e96b7351a48c9bff06e11635529d0b74cde3db.zip.