Download iPadOS 10.3.1 (14E304) for iPad 5 (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 iPad6,12
iPadOS Version 10.3.1
Release Date 2017-04-03
Update Date 2017-04-01
Sha1sum
7159c7730299440d20ace1e0c86844ea6040ded8
Sha256sum
fd0edd71f3dc1d7cab861c4c0d6eecd3f9ce666a6f48979a045c367066faadb4
md5sum
34aa80e57d2e905a2a9fe7b4c7d0b5a5
Size 2.25 GB
FileName
iPad_6,11_iPad_6,12_10.3.1_14E304_Restore.ipsw
Status

Download IPSW (2.25GB) Check device info
Release Notes

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

iOS 10.3.1 includes bug fixes and improves the security of your iPhone or iPad.

For information on the security content of Apple software updates, please visit this website:

https://support.apple.com/HT201222