iPadOS 9.9.11.2.1 (build 15C153) is an official Apple over-the-air update for the iPad mini 3 (WiFi), released on 2017-12-13T18:05:53Z. The update package is 1.48 GB. This is a delta (partial) update that requires 8.4 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 3030b762cd23c55f0b3f048a3bdf05df15595718.zip.