Download iPadOS 11.2.1 (15C153) for iPad Air 2 (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 iPad5,3
iPadOS Version 11.2.1
Release Date 2017-12-13
Update Date 2024-06-03
Sha1sum
5a673cb851a7c6b94c3a16cde0f780bbfed5f11f
Sha256sum
d22407b8ca84c30bc8ae54c6e00e3b85991bdb8ed96a3cc968081f9feeb6dc99
md5sum
2f5a8e21aa41456111aea8555536482e
Size 2.44 GB
FileName
iPad_64bit_TouchID_11.2.1_15C153_Restore.ipsw
Status

Download IPSW (2.44GB) Check device info
Release Notes

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

iOS 11.2.1 fixes bugs including an issue that could disable remote access to shared users of the Home app.

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

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