iOS 9.3 (build 13E6234) is an official Apple over-the-air update for the iPhone 6s+, released on 2016-03-21T18:55:25Z. The update package is 1.67 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: b3a57fc3e92ad5c6862a12790b13b3ee13140d65.zip.