I installed ULINK Pro driver. I have all FRDM-K64 examples working. However PC stopped detecting OpenSDA port. PC doesn't detect that port anymore. If I connect through K64 connector, it works with UNLIN Pro. In Device manager when I enable to see hidden driver I could mbed driver but it doesn't become visible. Then it tried removing driver and reinstalling it. Still there is no luck. Your help will highly be appreciated.