I had the k3 flashing red light MCU load lockup problem this week.
Tried all the recommended clean up of cables and so on with no results.
Very frustrating over a couple of days.
Using the utility V 1.12.10.10 and Beta K3fw4r60.
I think I found a "Feature".
When the Utility program starts, with port selected it reported that the
program is waiting for K3 to respond. If you click OK it then reports
that k3 is not responding.
If you immediately switch to the firmware window and start the download
all files button within the 3 or 4 seconds before the utility reports
that the K3 is not responding then it starts loading the firmware and
all is well. If you wait until the few second window is up then the
download button greys out and the utility continually looks for the K3
without finding it.
All is well now, with the latest Utility and Beta working well. By the
way the new CW decode design appears to work VERY well.
Howard at support suggested that the most recent compilation may have a
slightly different communications timing and might be unique to XP
machines. This is not necessarily proven and may be in work.
I hope this helps someone.
Aloha and 73,
John KH7T
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