iOS 9.3 (build 13E5237) is an official Apple over-the-air update for the iPhone 4s, released on 2016-03-28T16:53:07Z. 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: d4457fe0c7411ff91d8a487088be99ada4337dae.zip.