iPadOS 9.9.11.1 (build 15B5066f) is an official Apple over-the-air update for the iPad Air (WiFi), released on 2017-09-27T16:55:33Z. The update package is 1.68 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: 7b2d61414fb0e339523595f936948b9b9013b8cd.zip.