My k3 started to act up tonight. It was not putting out any power in CW, and was behaving as if it was in QSK mode even though it was in semi-breaking mode. The power output was OK in SSB. I tried to reload the FW and now it is stuck in MCU LD mode and the background light on the display is not lit. How do I get it out of MCU LD? Gregg W6IZT