tried open iphone, so diffcult to remove the black cover. after 40 minutes trying and get removed with little scratches. give up the metal cover remove.
so I am thinking, is there anyway we can H/W downgrade it without open it? maybe we can find some solutions over the Ipod connector. maybe we can put 1.8V ot even 3V+ votage on some pins of the connector and make it work same as test point?
will try oneday!