I am trying to help my friend root and put CM11 on his LG G2 ATT. I have it rooted now, but I tried to install Recovery and it did not work. I then tried to flash it with RomManager from within the app, it says it is correctly flashing(at least there is no error) but when I reboot into recovery I see this error briefly followed by black screen and lockup. I have to hold down power button to get it to reboot normally. I have no recovery at all now it seems. And I don't know how to get into Fastboot on his phone either. Any help would be awesome! I am attaching the error.