INSTALL/grub/help/en_US.txt

   1 Ctrl+h - Display this help information
   2 F1 - Memdisk Mode (Only for small WinPE/LiveCD ISO/IMG)
   3 F2 - Reboot/Power off
   4 F3 - Switch menu mode between Treeview <-> ListView
   5 F4 - Boot Windows/Linux in local disk
   6 F5 - Utilities
   7 F6 - Load Custom Grub2 Menu
   8 F7 - Switch between GUI Mode <-> TEXT Mode
   9
  10 Ctrl+m - Checksum image files (md5/sha1/sha256/sha512)
  11 Ctrl+w - WIMBOOT Mode (Only for standard Windows ISO)
  12 Ctrl+r - Grub2 Mode (Only for some Linux distros)
  13 Ctrl+i - Compatible Mode (Just only for test)
  14
  15
  16 Press ESC to return ......