Hi and thanks everybody,
tkaiser, the usb charger from apple have this information printed:
Output 5.1v , 2.1a
the BPI-M3 i have does have micro power option and dc power option. I have tried to install Ubuntu Mate 15.10 from here: http://bananapi.com/index.php/download?layout=edit&id=90 and it worked with the same micro usb power... i'm lost and dont understand why it does not work when i use the images on this website. I bought 7 BPI-M3 and now i feel i cant use them so i have lost a lot of money.