Hello! The problem is when i tryed to flash download or enter i get message "Device cannot enter bypass mode. Connection to target missing or incorrect". I cant find a reason why and when it happens. For about 3 mounth it works good. 1)Can i test my ULINK for capacity for work? 2)I find some connectors on printed circuit board of ULINK with RxD and TxD marks.What is destination of it?