There is a procedure in K3 Utility Help, Trouble shooting MCU load failure. 

Dick, K6KR


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> On Nov 16, 2016, at 19:12, David F. Reed <w5sv.d...@gmail.com> wrote:
> 
> Somehow while loading rev 5.54 to my K3, it locked up.
> It is hung up with the TX led flashing and the screen saying MCU LD.
> What can I do to recover from this disaster?
> 
> thanks & 73 de Dave, W5SV
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