@droftarts Hi Ian, I found the error, it was between the ears (my ears). I should have read more carefully. I hadn't paid attention to the fact that the first thing I had to do was upload a file using Bossa. After that everything worked fine. It was the file "Duet2CombinedFirmware.bin"
I'm sorry for having to employ you for nothing, but you still helped me, otherwise I wouldn't have read the documentation again.
Thank You and Greetings Harald

@droftarts Hello, I read nearly every Duet-Documentation, but at the end there's no respond from my Duet 2 WiFi Board. It seems as the hardware's broken.
Please excuse my lousy English.

@droftarts Hello Ian,
I followed the instructions exactly, unfortunately without success. I had also created a new SD card as instructed. But there is still no response from the board. Can you perhaps give me detailed instructions?

@droftarts Hello Ian, thank you for your advice. I'll try and let you know the result.
greetings Harald

Hello,

Linux Ubuntu 22.04
Duet 2 wifi Board
Firmware 3.4.6
WiFi Firm. 1.0.2
DWC 2.0.4

my duet no longer answers. I set the erase jumper and pressed reset. After that there was no response when I spoke to the board with "Cutecom". The connection to port ttyACM0 is established but there is no response to M122 or other GCodes. After connecting via a USB cable, the two voltage LEDs, the DIAG LED and the LED between the USB socket and the reset button light up. So I think the board is alive. External voltage was not connected.
What can I do and how to get the Duet fully functional again?