@dc42 In the mean time I tried to change the USB, downloaded Bossa, and I was able to erease and write the firmware. It works now! Thank you very much! 
Latest posts made by kjanusko
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RE: Duet 3 6HC USB connection problem after firmware updateposted in Firmware installation
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Duet 3 6HC USB connection problem after firmware updateposted in Firmware installation
Hi, I have updated the Duet 3 6HC firmware according to insructions via Ethernet. Since the update I cannot connect to my Duet 3 board. When I plug it in windows can not recognize it. I tried to erease it with jumper, but had no luck.
The LEDs:
-USB birght and red
-STATUS very dim
-3.3v bright and green
-5v bright and redI have no PI board to connect to it. Only PC at hand.
Any suggestions how can I fix this?