Dear CryBaby,
thank you very much for your answer. I tried a new installation with the image "Armbian_community_24.11.0-trunk.202_Cubietruck_noble_current_6.6.44_xfce_desktop.img.xz" and bluetooth is still not working.
I stopped to investigate more time to solve the problem.
My question can be closed or marked as solved.
Best regards
Albrecht