iOS 9.3 (build 13E5181f) is an official Apple over-the-air update for the iPhone 4s, released on 2016-01-14T18:01:21Z. The update package is 1.11 GB. This is a full OTA update that can be applied from any compatible base version. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: f89c8366987c19f3c1c65daed1045c846577fb52.zip.