Attempting the flash now, had a couple of failed attempts, where the ROG button would flash like three times or so, and then nothing...
Hadn´t given it any thought, but I removed all usb, internet, sound, and monitor cables, and now it seems to work. There´s a red diode near the CMOS battery that´s flashing...and now it´s stopped, and the ROG button is dark. I´ll reconnect my stuff and start´erup, I´ll leave the formatted key in the white usb socket.