Recently I flashed the 'dragonboard410c_sdcard_install_android' image and am able to boot Android successfully. Then I tried to switch back to emmc boot with all boot switches in OFF position[0-0-0-0]. Now am not to enter into fastboot mode. Irrespective of key combinations, the board starts to boot after 4 secs and is not entering into fastboot mode. What do I need to do to get the device into fastboot mode?