[Elecraft] K3 - stuck at MCU LD we upgrading software

[Don Wilhelm]

Tony,

The usual reason for that is a glitch in the computer.  The fact that 
the USB port is no longer detected points more to the computer than the K3.

Re-boot the computer, and see if it detects the USB adapter - that has 
to happen first.  Even if the USB port is internal to a K3S, the same 
thing applies, you must get the computer to recognize the USB adapter 
and assign a COM port to it.  If the port is internal to the K3S, power 
cycling may help as well.

Then follow the instructions to "Force a firmware load" in either the 
manual or in the K3 Utility Help file.

73,
Don W3FPR

73,
Don W3FPR

On 1/28/2017 12:27 PM, N2TK, Tony wrote:
>
> Upgraded firmware from 5.54 to 5.56. The one K3 did it fine. The second K3
> is hung up with the TX light flashing and the screen says "MCU LD".
>
> And the USB port is no longer detected.