during camera install I selected by accident "Normal GRD" instead of "Normal", now its continuously displaying the camera with no obvious way to get back to the menu's so  is there a HARD factory restart?

I've tried:

resetting via the tiny button on front

Disconnected battery and left for 20+mins

Tried putting on the same firmware (V2.63) again

none of the above has worked..

however repeatedly hitting the reset button does work