Download iOS 15.3 (19D50) 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 15.3
Release Date 2022-01-26
Update Date 2022-01-23
Sha1sum
1598cbf98181c2c094edaca262c8977f18ffbbf7
Sha256sum
a0de240f418815e4a4e1cbf1ee08b304a81977c4397e042bf6930254f287a436
md5sum
14708af4ccc6a6c9c37e59bbd4d85914
Size 6.20 GB
FileName
iPhone14,3_15.3_19D50_Restore.ipsw
Status

Download IPSW (6.20GB) Check device info
Release Notes

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

iOS 15.3 includes bug fixes and security updates for your iPhone and is recommended for all users.

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

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