Download iPadOS 9.2.1 (13D15) for iPad Air 2 (Cellular)

You will have to note that you can only restore signed IPSW firmware files using iTunes or 3utools.

❌ This IPSW firmware is not being Signed by Apple

Firmware Identifier iPad5,4
iPadOS Version 9.2.1
Release Date 2016-01-19
Update Date 2016-01-12
Sha1sum
29443fa607d1651e52667cf7409e6bf67911fd71
Sha256sum
6114c6dc3fdf5c77d1c3bb1e0cc32e397315c842a3780f94c7e0aff9fdcf8c8c
md5sum
7d29a088376b090fef7e4cbd8ddc178d
Size 1.86 GB
FileName
iPad5,4_9.2.1_13D15_Restore.ipsw
Status

Download IPSW (1.86GB) Check device info
Release Notes

It should be noted that these are the official release notes for the from Apple

This update contains security updates and bug fixes including a fix for an issue that could prevent the completion of app installation when using an MDM server.

For information on the security content of this update, please visit this website:

https://support.apple.com/HT201222