Download iOS 11.2.2 (15C202) 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 11.2.2
Release Date 2018-01-08
Update Date 2018-01-03
Sha1sum
bbc65f449d250bb0a4c5bde1ac19df0d8275e32b
Sha256sum
973d2784cd83553ec9e44bd3330003d99adec893e282dd6cb622017dd076dad2
md5sum
1f196cd7ac4649167ee1889c6bcd91aa
Size 2.47 GB
FileName
iPhone_4.7_11.2.2_15C202_Restore.ipsw
Status

Download IPSW (2.47GB) Check device info
Release Notes

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

iOS 11.2.2 provides a security update 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