Download iOS 8.0 (12A366) 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 8.0
Release Date 2014-09-17
Update Date 2014-09-09
Sha1sum
bfe00f19ca630bfd7c831ffc765ea3b32cf9e48b
Sha256sum
3b4f666660ddc4d78eb0b588e52e7aa4cfc685825ecb7cfbc8c09eb5500d1b12
md5sum
0afcb2551263ad425da70cc6e46f05ba
Size 2.21 GB
FileName
iPhone7,1_8.0_12A366_Restore.ipsw
Status

Download IPSW (2.21GB) Check device info
Release Notes

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

This update contains hundreds of new features, including the following:

Some features may not be available for all countries or all areas.

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

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