[Elecraft] Elecraft K3s transceiver blocked MCU LD

[German Duran]

Dear friends: My new Elecraft K3s is blocked.
When I open the box, connect power supply, in the display appear HIGH SIG.
It was not possible HIGH SIG dissapear, I tapped CONFIG, I looging for a
solution and nothing.
I want resetting the radio hold in shift knob while pressing power on
switch unit and now the radio shows MCU LD, and is totally blocked.
I didn´t save the original configuration from factory before to start
configuratio.
There is not  possible communication between radio and computer.

What can I do?

German HK3J