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Forcing a Firmware Download
If you accidentally load an old or incompatible
firmware version and find the K3 unresponsive, do
the following: (1) unplug the K3 from the power
supply and wait 5 seconds; (2) plug the power
supply back in; (3) hold the K3's POWER switch
in; after about 10 seconds, you'll see the TX LED
flash (you'll also see MCU LD on the LCD); (4)
load the correct firmware version.

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73, Ron AC7AC

-----Original Message-----


I tried to download latest K3 utility version 1.12.10.10 and ended up with
dead radio.  I tried the help advise and their recommendations ending with
still  nothing working.  I disconnected MicroHAM  keyer and the power  to
K3, connected radio direct to computer with  RS 232 outlet direct to COM
port, turned power off to radio, reapplied power and tried to reload
software and still only flashing TX LED with MCU LD showing without back lit
screen.  Any suggestion appreciated.
Roger, W7VV