Download iOS 15.2.1 (19C63) for iPhone 12 Pro

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 iPhone13,3
iOS Version 15.2.1
Release Date 2022-01-12
Update Date 2022-01-08
Sha1sum
80861bdd857a29484278eca0005fb2b1b819948b
Sha256sum
df8233ae60cf057c267d5a2e60e3f9c9ba506569361805f94723a3cbab6dca5c
md5sum
d4ef9296d0abf28d875a1b2bbab016ea
Size 6.36 GB
FileName
iPhone13,2,iPhone13,3_15.2.1_19C63_Restore.ipsw
Status

Download IPSW (6.36GB) Check device info
Release Notes

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

iOS 15.2.1 contains bug fixes for your iPhone including:

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

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