Linux Flash script update for TS100 (#1997)

* Using dd instead cp and unmount tmp folder immediately

* add sudo to rmdir

scripts/flash_ts100_linux.sh

@@ -75,7 +75,7 @@ umount_ts100() {
         echo "Failed to unmount $DIR_TMP"
         exit 1
     fi
-    rmdir "$DIR_TMP"
+    sudo rmdir "$DIR_TMP"
 }
 
 check_flash() {
@@ -126,14 +126,13 @@ echo "Found TS100 config disk device on $DEVICE"
 
 mount_ts100
 echo "Mounted config disk drive, flashing..."
-cp -v "$1" "$HEX_FIRMWARE"
-sync
+dd if="$1" of="$HEX_FIRMWARE" oflag=direct
+umount_ts100
 
 echo "Waiting for TS100 to flash"
 sleep 5
 
 echo "Remounting config disk drive"
-umount_ts100
 wait_for_ts100
 mount_ts100
 check_flash