Download iPadOS 8.1.3 (12B466) for iPad Air (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 iPad4,1
iPadOS Version 8.1.3
Release Date 2015-01-27
Update Date 2015-01-19
Sha1sum
559125d2490ae84e66f2d8be172a7b767e8ebd3b
Sha256sum
7ccc8671d4a3461385a1b6539410692ac449e9c8255388e4684a13f0838561b0
md5sum
239ed6075c9af7b867857b04314e11bd
Size 1.89 GB
FileName
iPad4,1_8.1.3_12B466_Restore.ipsw
Status

Download IPSW (1.89GB) 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