I had that once and it turned out to be a wire connected to my key line was contacting some other device.  I'd suggest you look for any connection between your key or cable and something else.

--Dave W8OV

On 4/12/2022 20:25, John D Freed wrote:
I was upgrading my elecraft k3 (ser# 7023) to the latest firmware.  I now have 
the following message:  ERR KEY.  anyone have a solution to fix this 
situation??  I would like to know how to clear this error and get my rig up and 
operating.
John KX6F
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