Download iOS 5.1.1 (9B206) 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 not being Signed by Apple

Firmware Identifier iPhone3,3
iOS Version 5.1.1
Release Date 1970-01-01
Update Date 2012-04-27
Sha1sum
70b736f826335ccefbc9941c3bb5d3b211236461
Sha256sum
9858070c6e36dd013474223a38359d03f4cb60dfb0215c730ef1e0ed536f6404
md5sum
730d2a2c760c3b8267258447ff19a064
Size 0.77 GB
FileName
iPhone3,3_5.1.1_9B206_Restore.ipsw
Status

Download IPSW (0.77GB) Check device info
Release Notes

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

This update contains improvements and bug fixes, including:

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

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