Download iOS 15.3.1 (19D52) for iPhone 12 Pro Max

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 iPhone13,4
iOS Version 15.3.1
Release Date 2022-02-10
Update Date 2024-06-03
Sha1sum
7247fdfbf5a1f45c70396abc0403834585ec4268
Sha256sum
0854c7e389f58a14232cabdae01a2229c35ee1d80337b0f3ddabda3f5bd8f922
md5sum
3860e594127ccd0dd6715c20f540f36c
Size 6.19 GB
FileName
iPhone13,4_15.3.1_19D52_Restore.ipsw
Status

Download IPSW (6.19GB) 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