Hello again guys! Is anyone here familiar with chip tuning? I have a problem that became nightmare to me... I m messing around with 0261200402 silver label M50B20 dme with chip type 27C256..I can read it with my Willem programmer. I also have many tuned maps (bin files from eBay chips). My problem is that,i can delete using UV the chip,and write again without problems the STOCK map...if i try to write a tuned map,i get errors during writing! I have double checked jumpers,Vcc,Vpp and bin files size.... If anyone is willing to help me,i can provide more infos!