Power + Vol Up is download mode
Power + Vol Down is recovery
Power + Vol Down while connected to pc is software update mode and it is for flashing firmware or updateing via pc suite
I had problems with my O4X for no reason last night, it froze in the camera app and after I pulled the battery it would get stuck with the logo or a lockscreen with black behind it. I fixed this from recovery with a factory reset. I was not using the app from this thread, nor other hardware control apps. Firmware V09b.