The solution is here [Updating problems]

Alright so i promised everyone a solution to the updating problem, so here it is.

A little recap, a friend of mine wanted to sell his iphone 3gs and so tried erasing all the data from it, which froze the phone to the apple logo screen. Upon searching around i found out that there is indeed a problem with the firmware and it freezes when you try to erase all the data from the phone.

So, restoring should be the solution right? in this case it wasn't. I found out that Apple put in another layer of security, which validates any and all restores with a ECID value. What i could deduce was that it checks whether the firmware has been tampered with and in this case, jailbroken. So i couldnt restore it to the firmware 3.0.

i played around and gambled with the phone. i updated the firmware to 3.1.2 and jailbroke it with blackra1n. Miraculously it worked.

So the solution plain and simple, if you are running firmware 3.0 or 3.1 and can't restore the phone then update to the latest and as a safety precaution save the phone's ECID with Saruki's server.