Download iPadOS 15.3.1 (19D52) for iPad Air 4 (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 iPad13,2
iPadOS Version 15.3.1
Release Date 2022-02-10
Update Date 2024-06-03
Sha1sum
9a4429d60f4cf01e70aa200f084a312c3225da21
Sha256sum
09b3fd429b1c99d7a406b2dc17291c30859516f43c541a9c98fee9aa61dc8cff
md5sum
c046c1b4f3ab0dd0975ed9bf26f4a977
Size 5.45 GB
FileName
iPad_Fall_2020_15.3.1_19D52_Restore.ipsw
Status

Download IPSW (5.45GB) Check device info
Release Notes

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

iPadOS 15.3.1 provides important security updates for your iPad and fixes an issue that may cause Braille displays to stop responding.

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

https://support.apple.com/kb/HT201222