Re-install the GRUB 2 in M-NotePC3

debian、dual boot
  1. in debian (which was selected through overriding in BIOS)(in last section:BOOT)
  2. as root; # grub-install /dev/sda
  3. message says; Installing for x86_64-efi platform. Installation finisahed. No error reported.
  4. Grub2 perfectly recovered.
  5. ref: https://securitronlinux.com/uncategorized/reinstalling-grub2-bootloader-in-debian-6-0/
  6. Still, cannot be booted from usb key.