Hello I have the same problem, there's no green light, only red and white, stuck in boot, never enters the OS.
I have tried the "hard reset" option and the USB method without success many, many times.
In USB method the box starts the installation of the file but when reaches the end it just doesn't boot in the OS, it responds to all the commands from the remote control but never passes the Android logo, and the "hard reset" is never a success.
What can I do different, do you have any other file to install?
Thanks in advance.