Hello
Thanks for you answer, I understand the point that if even though M2B & M2U are very close, it does not mean it will work.
I really thought it was a simple thing to change "just" to turn off/on the board, as all the rest is perfect.
I had a look to https://docs.armbian.com/Developer-Guide_Build-Preparation/
but honestly I am not skilled enough to to this, I did not understand how building it on my PC will make it work on the BananaPi, and the config
./compile.sh build \
BOARD=uefi-x86 \ #bananapim2b does not seem to exist
BRANCH=current \
BUILD_DESKTOP=no \
BUILD_MINIMAL=yes \
KERNEL_CONFIGURE=no \
RELEASE=trixie
does not help on which string using for my board.
Regards