your serial number doesnt have to begin with M0 at all. ford radio serial numbers start with any of the following letters A,C,L and M. if thats your serial number that you have posted above that begins with c then your code will be either
3 digit code...........554
or
4 digit code............1244
if none of the above work then have another look for any other numbers on the stereo and post them on here again and i will get you the code, hope this helps
good luck and merry xmas