Download iPadOS 13.5.1 (17F80) for iPad Air 3 (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 iPad11,4
iPadOS Version 13.5.1
Release Date 2020-06-01
Update Date 2020-05-28
Sha1sum
3d4b4bb89fe490e451f273b1279b23f2ea5dfc69
Sha256sum
78d799606a694480890e57d5b5b3157d12b3a1759eeb8a01f8ffc07eded4ff7e
md5sum
6246d5c4e4980b01cac8bc331e244654
Size 3.89 GB
FileName
iPad_Spring_2019_13.5.1_17F80_Restore.ipsw
Status

Download IPSW (3.89GB) Check device info
Release Notes

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

iPadOS 13.5.1 provides important security updates and is recommended for all users.

Some features may not be available for all regions or on all Apple devices. For information on the security content of Apple software updates, please visit this website:

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