Download iPadOS 8.1.3 (12B466) 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 8.1.3
Release Date 2015-01-27
Update Date 2015-01-19
Sha1sum
9fdb75246e67882e9992a4eefa6938657365f076
Sha256sum
a1cb50f73524d073b8b63a1a0bbdeb99f800b2f615c76bb3fb5149b8eb507392
md5sum
dd19cf304c196e820ded9dcc86558db0
Size 1.95 GB
FileName
iPad5,4_8.1.3_12B466_Restore.ipsw
Status

Download IPSW (1.95GB) Check device info
Release Notes

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

This release includes bug fixes, increased stability and performance improvements, including:

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

http://support.apple.com/kb/HT1222