You may need to use the RS232 adapter cable in this case.
Lyle KK7P
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
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.
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