@calusbr
did you get it to work?
i reread your question, and see you copied /boot.
If i look at the kernel update file from devmfc (linux-image-6.12.17-meson64_20250228_arm64.deb) there is also the folder: /lib with files in it
maybe you are missing a module? (better take the folder from the image)
btw: devmfc did update: