Run root.bat.
At the very end of the bat, you need to type the following commands manually.
/data/local/tmp/run_root_shell
mount -o remount,rw /system
cp /data/local/tmp/su /system/xbin/su
chown 0.0 /system/xbin/su
chmod 06755 /system/xbin/su

これをしないと駄目なのか