Download iOS 11.1.2 (15B202) 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 iPhone8,2
iOS Version 11.1.2
Release Date 2017-11-16
Update Date 2017-11-15
Sha1sum
360803497dc58414d4f17cb9242db0f4c465b8bb
Sha256sum
2b970232bb1b2b36b50e19cdc69c3d8d2e2a0f77d537771d1ed075cb90f9c734
md5sum
54b5f695a87c96b68d03573b257d0890
Size 2.66 GB
FileName
iPhone_5.5_11.1.2_15B202_Restore.ipsw
Status

Download IPSW (2.66GB) Check device info
Release Notes

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

iOS 11.1.2 includes bug fixes for your iPhone and iPad. This update: