failed to start with nvidia jetson nano


I am workig on a nvidia jetson nano at the moment. I am trying to configure the SPI pins. To do this I want to use the Jetson Expansion Header tool. The issue is that I recieve the following erro: “no DTB found for NVIDIA Jetson nano Developer kit”.
I don’t understand why i have this error. Below I have images of the extlinux.conf and of my boot. Here you can see that the DTB files exist and that it is added correclty. Does anybody have any advice? I dont want to fully reset my Nvidia because I would lose a lot of my work.

Hi cianolieslagers.sji,

Are you using the devkit or custom board for Jetson Nano?
What’s your Jetpack version in use?

Have you customized device tree or modified any files under /boot before?

Please share the result of the following command on your board.

$ cat /etc/nv_tegra_release
$ cat /etc/nv_boot_control.conf
$ ls -l /boot