iOS 9.9.15.4.1 (build 19E258) is an official Apple over-the-air update for the iPhone 6s+, released on 2022-03-31T17:14:58Z. The update package is 3.94 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: 5628a0cc4396719e624cd7c9642ba9244499877e.zip.