Download iOS 16.3.1 (20D67) for iPhone 13 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 iPhone14,3
iOS Version 16.3.1
Release Date 2023-02-13
Update Date 2023-02-09
Sha1sum
ed330b292870c1394301d50dffbe039ffd4e6c22
Sha256sum
99cec2ac92ddc960afe5c4c8ebee8c00e0b7aba8c15d7e07fbba3a869b3a485f
md5sum
98ef6045218845c38b533c9dac9e2a0e
Size 6.14 GB
FileName
iPhone14,3_16.3.1_20D67_Restore.ipsw
Status

Download IPSW (6.14GB) Check device info
Release Notes

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

This update provides important bug fixes and security updates for your iPhone including:

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

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