Download iOS 15.3.1 (19D52) for iPhone 13

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 iPhone14,5
iOS Version 15.3.1
Release Date 2022-02-10
Update Date 2022-02-07
Sha1sum
d8accfc0cadfd9f3616f9676b012b8381b5cc525
Sha256sum
4aa18c5fd88538f365317db30b374679042d3135c292a260cff2eb1b1de3908f
md5sum
b2768d2f64170e17a8b0e70eaf1c835d
Size 6.18 GB
FileName
iPhone14,5_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