Download iPadOS 8.1.3 (12B466) for iPad Air (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 iPad4,2
iPadOS Version 8.1.3
Release Date 2015-01-27
Update Date 2015-01-19
Sha1sum
f246641ccf15146cfb1a875fd7e265b484bcf3ba
Sha256sum
bd05254809b538ad847c51c4a77a1c92d40e40f7f152a4aa52d3ddf932126d46
md5sum
ac64732b5b2722966303bce6a1f44fa8
Size 1.93 GB
FileName
iPad4,2_8.1.3_12B466_Restore.ipsw
Status

Download IPSW (1.93GB) 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