i tried to root my kindle fire 1st gen recently and to no avail it failed. i used the kindle utility and it started out great then got to rebootind the kindle and i get a waiting for device message and the pc no longer realizes the kindle . after reinstalling the adb drivers in the kfu package as instructed i get almost through and it says drivers unsigned and aborts please tell me what i am doing wrong as my kindle is now softbricked at the boot screen