Download iOS 11.4 (15F79) 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 11.4
Release Date 2018-05-29
Update Date 2024-06-03
Sha1sum
21283cfe387841f3db7c9f88b56e646823706faf
Sha256sum
236143539b76d36d14466f15a7f29946083bd9f51bc27e01ac9e147ae72be5b4
md5sum
e68d25ed10e6360da147db5fb06b89a0
Size 2.58 GB
FileName
iPhone_4.7_11.4_15F79_Restore.ipsw
Status

Download IPSW (2.58GB) Check device info
Release Notes

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

iOS 11.4 includes AirPlay 2 multi-room audio, support for HomePod stereo pairs, and Messages in iCloud. This update also includes bug fixes and improvements.

AirPlay 2

HomePod stereo pair

Messages in iCloud

Other improvements and fixes

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

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