Download iOS 11.1.2 (15B202) 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 11.1.2
Release Date 2017-11-16
Update Date 2017-11-15
Sha1sum
7318de5b0611480d2c8c84817c14e33986a8da5c
Sha256sum
cbe7b2fb82ccf08981f7fcccb5af1eab0aad2b28cb343efa2ae366ec40330227
md5sum
b222abe4fcfbb5cfbbe68e2ce87288ce
Size 2.48 GB
FileName
iPhone_4.0_64bit_11.1.2_15B202_Restore.ipsw
Status

Download IPSW (2.48GB) 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: