Download iOS 11.2.6 (15D100) for iPhone 6+

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 iPhone7,1
iOS Version 11.2.6
Release Date 2018-02-19
Update Date 2018-02-16
Sha1sum
d830b3db666fb8afcf50aa88eb5d56453e826874
Sha256sum
654754dcda34f593b9a1a6bae82808fc9825b4992d32188283f31a3e318755ae
md5sum
f37c4bd7e0f44b01d13dd42a4af49180
Size 2.62 GB
FileName
iPhone_5.5_11.2.6_15D100_Restore.ipsw
Status

Download IPSW (2.62GB) Check device info
Release Notes

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

iOS 11.2.6 includes bug fixes for your iPhone or iPad. This update:

For information on the security content of Apple software updates, please visit this website: https://support.apple.com/kb/HT201222