Download iOS 11.4 (15F79) for iPhone 5s (GSM)

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 iPhone6,1
iOS Version 11.4
Release Date 2018-05-29
Update Date 2018-05-18
Sha1sum
2498155576945af920b1aa4137b26d8312672f46
Sha256sum
184d1b39a26e8970677f53649912a2c442588b40ca3dbdc1e8e291a37244aca4
md5sum
6d84e23e3a8b129e23db949dd3d16c27
Size 2.54 GB
FileName
iPhone_4.0_64bit_11.4_15F79_Restore.ipsw
Status

Download IPSW (2.54GB) 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