I have an existing minibian installed to raspberry pi 2, and i wanted to change to Banana Pi M3. is there anyway to clone my existing sd card to emmc flash storage and boot by default?

Thanks for any answers, Larry

You might be able to re-use your rootfs but you won’t be able to boot. The M3 needs a totally different bootloader and different kernel.

And I would assume it will take months until you get the first OS images from the M3’s manufacturer that do work somehow (at least it took that time with the M2 back then – they don’t release their stuff ‘until finished’ so you can’t even help yourself by fixing their mistakes)