I just found something , I pressed plus and minus to get into special menu . Then I pressed minus and power button and it brought me to new screen called C and underneath was 0000. I could change the value of the 4 digit number to anything. Why was it at 0000? Is it safe to change it? I wondered maybe the value is meaningless unless it is changed. I am worried to change it. If it is speed setting that is sort of ridiculous , as if it gives option to change speed to 9999 km/h.