Download iOS 15.7.4 (19H321) for iPhone 6s

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 iPhone8,1
iOS Version 15.7.4
Release Date 2023-03-27
Update Date 2023-03-16
Sha1sum
a95b7e49dea3327d87055e1b0e43d1ede1956b1e
Sha256sum
5594c296e26d63501fa75137679451fcbd2bd350c6195d9c5ce2ac15bb1a6025
md5sum
b15f0f91528cbe4e10a82ea453294db4
Size 4.91 GB
FileName
iPhone_4.7_15.7.4_19H321_Restore.ipsw
Status

Download IPSW (4.91GB) Check device info
Release Notes

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

This update provides important security fixes 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