I have implemented flashbash hardware2.49,I used st264,I have compiled isp.stw and downloaded it in the mcu.but it dosn't work! when I plugin the power,redled blinks and I have about 5 volt on mcu supply, as I connect the rs232,mcu dies! I don't know where is the problem,it seems the problem is with interfacing... shall I have some changes in firmware? Best Regards, Mary.