Download iPadOS 8.1.3 (12B466) for iPad Air 2 (WiFi)

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 iPad5,3
iPadOS Version 8.1.3
Release Date 2015-01-27
Update Date 2015-01-19
Sha1sum
bbde53e2dc395ca0466c3bc79a32e80710c3652e
Sha256sum
afc80cf4eb29627b4fd51045c7bd7451afdac3bfcab9fa6c69bd7c2ff47adf1a
md5sum
a82fe57b6a4c889485974f3d08c4e6f9
Size 1.90 GB
FileName
iPad5,3_8.1.3_12B466_Restore.ipsw
Status

Download IPSW (1.90GB) 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