Thank you very much!
I didn't expect such quick answer and such an easy fix.
The DWC connects now to the DCS.

Hello
I use a Duet3 with a Pi4. I never worked with 3D printers before and have no background in electronics. The system was set up in March and worked well until yesterday.
So yesterday I tried to update the RRF (to Release 3.01-RC9) following the instructions on the wiki (https://duet3d.dozuki.com/Wiki/Getting_Started_With_Duet_3#Section_Updating_Duet_3_main_board_firmware). After uploading the new files to the DWC and starting the installation the DWC now can't connect to the DCS.

After some troubleshooting without success I reinstalled the DuetPi but still no connection to the DCS is possible.

The versions I'm using:

The error message

Connections to the pi

All the cables are still plugged in. There is no SD card in the Duet board.

I have no idea what to do now.

I hope someone can help me. Thanks in advance for your support.