I flash the Ubuntu Mate image to SD Card and seem that there is no display. The power LED blink after several seconds showing that the BPI-M64 reset after several seconds. I changed to other SD Card and it still the same. It works for the previous version of Ubuntu Mate and somehow this new version doesn't work.
You must power the board with at least 2.5A to be able to have 1080P, eMMC,BT and Wifi. Use good PSU to ensure 5v on boot up and power the board using the barrel connector, never use the microUSB to power the board.