Ford ka radio code?

Hi, ive reinstalled the original head unit into my ford ka and its asking for a code, ive tried allsorts of combinations and looked all over the net and cant find the right code. Its a 5000rds eon radio, serial code M002671, if anyone could help you'd be a lifesaver...the musicless drives and wasted hours guessing n waiting to enter codes are sending me crazyyy! Thank you veryyyy much.