Download iOS 15.3.1 (19D52) 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 15.3.1
Release Date 2022-02-10
Update Date 2024-06-03
Sha1sum
b0d1050ec4cfc4c7556d86fdb2144948cfaeffe7
Sha256sum
a61da3258712c5524c868c1e4fc388ed8ae49446f44916c18765475610a5f44a
md5sum
4977e9335bf2640c0851edd496d4935f
Size 6.35 GB
FileName
iPhone13,2,iPhone13,3_15.3.1_19D52_Restore.ipsw
Status

Download IPSW (6.35GB) Check device info
Release Notes

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

iOS 15.3.1 provides important security updates for your iPhone 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