iOS 9.9.15.5 (build 19F6077) is an official Apple over-the-air update for the iPhone 6s+, released on 2022-05-16T18:24:11Z. The update package is 3.96 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: 364e8ae99062b304a31956b778215980670419ec.zip.