iOS 9.9.15.5 (build 19F77) is an official Apple over-the-air update for the iPhone 6s, released on 2022-05-16T18:25:21Z. The update package is 3.82 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: 19e1068cf58834c0a716a7cc3e1a497011317c47.zip.