Looking at your label again then it does have two Serial NumbersAlextdci wrote:And this is sure to work?
M000664 code is 2374
and
M100664 code is 7929
I would try the 7929 first.
Your problem is that someone has entered too many wrong codes previously and didn`t stop early enough to seek advice ....so I suspect they were using the first/ main serial number code I quoted initially in error