Is there anyway I can downgrade my iPhone 4

Downgrading is Not Supported by Apple.

Unauthorized modification of iOS

http://support.apple.com/kb/HT3743

Does anyone else think it's funny that someone could suggest that using Apple's official firmware files on one's iDevice would be considered an unauthorized modification of iOS? How's that work?

Older versions of firmware are no longer signed by Apple and are

no longer considered offical firmware files - therefore using an old

version of iOS is considered an unauthorized modification once

a newer version has been installed on the iPhone in question.