Download iOS 15.3.1 (19D52) for iPhone 13 mini

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 iPhone14,4
iOS Version 15.3.1
Release Date 2022-02-10
Update Date 2022-02-07
Sha1sum
45eb67549aaab4da42de270e3b69241f584763f1
Sha256sum
d68c64b8ef0b6ce3f3b469124b9ed2b113cb36eacc04cade16df80bad447f65b
md5sum
6543979b6b53054f8d17ff6a8a96b6bf
Size 6.18 GB
FileName
iPhone14,4_15.3.1_19D52_Restore.ipsw
Status

Download IPSW (6.18GB) 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