sorry bud! your phone is a CID 53 and therfore it cant be debraded(not for free atleast/but possible if your willing to pay).
Regarding the files you need, you will find an explination in the tutorial in the homepage of top sony.
Next, if you do flash your phone, EVERYTHING on your phone will be lost (games, wap setting and homepages etc.) and restoring your GDFS will not help bring those back. ...i know it sucks...but we got to live with it...