VTPATH_OLD=$PATH; PATH=$BUSYBOX_PATH:$VTOY_PATH/tool:$PATH
-$BUSYBOX_PATH/insmod $VTOY_PATH/modules/dax.ko
-$BUSYBOX_PATH/insmod $VTOY_PATH/modules/dm-mod.ko
+[ -f $VTOY_PATH/modules/dax.ko ] && $BUSYBOX_PATH/insmod $VTOY_PATH/modules/dax.ko
+[ -f $VTOY_PATH/modules/dm-mod.ko ] && $BUSYBOX_PATH/insmod $VTOY_PATH/modules/dm-mod.ko
wait_for_usb_disk_ready