Rinex Colour TV is stuck on Factory mode?

Hi, im not sure what happened between my hubby and two baby boys but somehow they managed to set our Rinex Colour 74CM TV set on to Factory mode. TV works but with limited functionilalty. Volume and all options to increase or decrease only gives an option of 0, 50 and 100 - i dont know about you, but you either have to be short of a few screws to listen to the high volume or be a brilliant lip reader to watch on mute