Download iOS 8.1.3 (12B466) 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 8.1.3
Release Date 2015-01-27
Update Date 2015-01-19
Sha1sum
53e7f12e1b3b307a3b46d54a0eeebac072a5e1d3
Sha256sum
9d33ffaba779cf6e4700b4cbbd2e5795e342e48505438ec0910a20c996d01f6f
md5sum
cb9276d57ad4bcfcb209629071465bd0
Size 2.05 GB
FileName
iPhone7,1_8.1.3_12B466_Restore.ipsw
Status

Download IPSW (2.05GB) Check device info
Release Notes

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

This release includes bug fixes, increased stability and performance improvements, including:

For information on the security content of this update, please visit this website:

http://support.apple.com/kb/HT1222