Download iPadOS 11.2.1 (15C153) for iPad Pro 9.7-inch (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 iPad6,3
iPadOS Version 11.2.1
Release Date 2017-12-13
Update Date 2017-12-10
Sha1sum
cb2ff059e91f2d10ae203580316d3b77a7551473
Sha256sum
379b6e9900d95a477ade32e1b27988495a42310dde6036b09c2e5bb01f7c5cb6
md5sum
9da0bf01341414a6c4087de38144967c
Size 2.35 GB
FileName
iPadPro_9.7_11.2.1_15C153_Restore.ipsw
Status

Download IPSW (2.35GB) 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