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

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 iPhone3,3
iOS Version 7.1.2
Release Date 2014-06-30
Update Date 2014-06-20
Sha1sum
aaeda3c8e1979189faa153cdf43e817a3f81f74c
Sha256sum
9e5fb22898fec54bd2e01adbd45e9ffe1f9e39bd8da8c8bc29ca1d76cfc215d6
md5sum
f3206fb96ccfbf66174b26778eae1caa
Size 1.12 GB
FileName
iPhone3,3_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