Hi since ih8snow is sleeping now, did anyone try to read the disclaimer that sn0wbreeze support only old bootrom, modem @05.11.07, anything higher than that is not supported!!!,if you used spirit to jailbreak not supported!!! there's is no existing exploit in 05.12.01 or higher that's why you have 1600 error very simple they are using blackrain to unlock the iphone (blackrain never works in 3.1.3 -5.12.01 right). it will not work.... it's working if you used snowbreeze v 1.5 before, it means that if you're using 3.1.3 05.12.01 or f....g higher it will not work!!! period!!!