Hello,
I'm newby here.
I bought Iphone 2G on ebay.
It was unlock in OS 2.2.1 (I don't know how...)

I have done a mistake : I have done the upgrade to OS 3.0 !

Now the Iphone is deactivated and locked back on AT&T.
--> Itunes doesn't let me do the restore.
--> Itunes says "Activation not possible. SIM card not compatible. blabla..."

How can I unlock it now that Itunes doesn't let me downgrade to OS 2.x..
I was about to use redsn0w but I can not perform first step (restore) in Itunes.

If anyone can help, it would be very great !

PS : I can not use AT&T SIM card because we don't have them in Europe ;=(