Download iOS 6.1.3 (10B329) for iPhone 4[S]

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 iPhone4,1
iOS Version 6.1.3
Release Date 1970-01-01
Update Date 2013-03-13
Sha1sum
7a62ee60b574301a6aafc48dcc9cccf0894ffb27
Sha256sum
601d51123257da0e678816e95d50a21f74b53864d2ed6d310b765eb3e8aa56d2
md5sum
ecfb58ced2e5f3edf35e8b5e19b2e8ad
Size 0.90 GB
FileName
iPhone4,1_6.1.3_10B329_Restore.ipsw
Status

Download IPSW (0.90GB) Check device info
Release Notes

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

iOS 6.1.3

This update contains improvements and other bug fixes including:

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

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