I have my brothers AT&T LG G Flex, model # LG-D950. When the Kit-Kat update was rolled out I updated my device with no problem. My brother on the other hand said that he attempted the update and it put the device into Fastboot Mode. I think he tried to root it and screwed it up. I have spent hours searching for a solution and trying to fix the device. I have tried multiple programs to try to flash the phone, and cannot find one that will recognize it in fastboot mode.I have tried to follow other threads to go back to stock and tried booting it with different button combinations to try to get it into download mode, and have not had any luck. Anyone out there have any knowledge on LG devices and how fastboot works and a way out of it?