Thanks!

Step 4 was not possible for some reason, but after step 5 my device startet booting from SD card again, thanks alot!

Hi, afaik there is no image for Debian Trixie, but you can use Debian Bookworm Core https://drive.google.com/drive/folders/142vQ7dGR2weEp1k55htKzZvl4vkcTizK and than upgrading to Trixie the tradtional way, see: https://linuxconfig.org/how-to-upgrade-debian-to-latest-version Works for me without prob...