If you can post a pic of a DM500 cloned open, I can show you the chip in question.
About the programmer, it was a huge thing, bigger than the DM500, he put above it in a slot a kind of chip holder where he slides the one remover from the box. He uses a computer to flash it, after 10mn, it's done! He put it back.
Et voila! DM lights up, it raises from death