well it's been 5 hours now and i believe i've tried every possible method to get this working. i have successfully downgraded by iphone 3G back down to 3.1.2 from 3.1.3 using itunes 9.0.
Problem is .. Carrier doesn't work. i've tried to manually mess with the ipcc file by checking this website on tethering it. i figured updating that will get it working since about 2 hours ago i tried updating my itunes to 9.1 knowing it will give me problems but luckily i used the blackra1n fix called Blackfreeze. (you can see why it took me so long i had to do research at the same time)
anyway, if ANYONE has an answer for this pleaseeeeeeee tell me.
i want to get AT&T working on a jailbroken 3.1.2 because i believe apple just implemented this **** to give us more of a headache. i won't be surprised if i see more threads about this.