Octopus V1.1 detected but is unresponsive

I am currently setting up a ratrig vcore 3.1 and am struggling with the firmware setup.
I have connected the raspberry to the btt octopus v1.1 as described in the instructions.
After inserting the microSD card, I was able to start the configuration via 'http://ratos.local/configure'.
After selecting the control board and flashing the firmware via microSD card, the following message appears:
"
Octopus V1.1 detected but is unresponsive.

Klipper doesn't seem to be running on your board, which may indicate faulty firmware or a faulty board. Please check your board and try flashing it again.
"
Flashing the firmware seems to have worked, as the SD card now contains a .CUR file instead of a .bin file.
dmesg gives the following output:
"
[ 5602.331123] usb 1-1.3: new full-speed USB device number 7 using xhci_hcd
[ 5602.442537] usb 1-1.3: New USB device found, idVendor=1d50, idProduct=614e, bcdDevice= 1.00
[ 5602.442556] usb 1-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 5602.442562] usb 1-1.3: Product: stm32f446xx
[ 5602.442567] usb 1-1.3: Manufacturer: Klipper
[ 5602.442572] usb 1-1.3: SerialNumber: btt-octopus-11
"
and ls /dev/serial/by-id returns
"
usb-Klipper_stm32f446xx_btt-octopus-11-if00
"
Does anyone have an idea what the problem could be?

I already tried:
  • a different microSD card
  • everything is unplugged except 24V power, 5V power for the raspberry pi and USB connection between the pi and the octopus
  • flashing the octopus with 5V USB power
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