Download iOS 7.1.2 (11D257) for iPhone 4 (GSM)

You will have to note that you can only restore signed IPSW firmware files using iTunes or 3utools.

✅ This IPSW firmware is Signed

Firmware Identifier iPhone3,1
iOS Version 7.1.2
Release Date 2014-06-30
Update Date 2014-06-20
Sha1sum
81da17b3e893a61508fe203849b7e1f60e2127b1
Sha256sum
8df4acce2cc2989ad159f980dd65a4bdc8c9eab4000e35169baa70ceb8749b2d
md5sum
6ed6cb1c2eac7177f96c9fbcf04a4f34
Size 1.12 GB
FileName
iPhone3,1_7.1.2_11D257_Restore.ipsw
Status

Download IPSW (1.12GB) Check device info
Release Notes

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

This update contains bug fixes and security updates, including:

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

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

IPSW File Download FAQ