You can't flash your phone to CID52 by applying CID52 firmware. CID52 is prerequisite to CID52 firmware, and is independent of it.
You must first upgrade to CID52, and then flash the firmware. You can't do it with SETool2Lite, but must use XS++.
It is as simple as running XS++, and when asked to upgrade to CID52, clicking YES, no extra files required or anything.
After you do that, you can do the flashing with SETool2Lite as described in tutorial.