Iphone 3GS Bricked Please Help

[joshd8401]

I have recently tried to update my iphone 3gs jailbroken at 3.1.2 to ios 4.2.1. When i did this it bricked the phone for some reason and everytime i try to restore on itunes it say error 29.It is stuck on the connect to itunes screen. I can tell that it is on 4.2.1 software because the connect to itunes graphic shows the new itunes icon. I am using a windows computer. Can i please have detailed instructions in what to do. I would also like to know why it bricked. Thank you please help me

When i connect it to itunes it says restore, i click restore and it comes up with i must restore and update, so i do this and it goes all the way to the end until it reaches restoring iphone fiormware, this goes all the way to the end but then stops, itunes then comes up with itunes errpr 29 and the iphone reboots into recovery mode... Any ideas?

[Simon]

Have you tried restoring from dfu mode?