Hey guys I bought an official unlock Iphone4 16gb and jailbroke it . It worked fine for a month and then suddenly one day I realised it was just showing apple logo and the phone wasnt starting. I thought it will be an easy fix but it wasn't. Now when ever I connect my phone to itunes it shows waiting for Iphone and then approx after 15 mins it shows Iphone cannot be restored with unknow error9 and sometime shows error 1604. I tried everything and someone told me I bricked my phone and the logical unit has to be changed which will cost some what $500. Please someone help . I even tried connecting to different pc and one time it showed error 3194 and I did try that host editing thing but still it didn't restore. Please if someone has any idea what to do the please suggest.

and ya I am using the latest Itunes and trying to download the latest version i.e 4.2.1

and I havent saved any of my SHSH blob and stuff ....

Publish on a paste-site your restore logs, we can't help you with so little details.

http://www.hackint0sh.org/f137/130802.htm

Apple is still signing 4.2.1 so you must have been restoring an older iOS version to get the 3194 error

You could try hard resetting your iPhone, just a thought, do a search here for a hard reset guide.