I flash my new LG G2 with CM11, and it was working ok. I downloaded some various camera apps to try out and the phone crashed while in one of them. It now cannot be turned off and stalls at the LG splash screen. I cannot get into the bootloader or download mode as it never makes it past the LG screen.
I have flashed this phone back to stock already once. My computer still recognizes the phone and loads the drivers necessary to flash it, and LG Tools sees it sitting on COM41, but I cannot proceed. I don't know of any other way to get it into download mode. adb sees it as an unauthorized device.