If you have CID52, you can use this tutorial(B. How to apply the generated patches to DB2020 CID52 phones).
http://www.topsony.com/forum/unlocki...html#post57483.
If you have CID53, you can use these tutorials:
http://www.topsony.com/forum/far-man...tml#post111201
http://www.topsony.com/forum/video-t...tml#post112515
If you have CID49, or CID51, you can upgrade to CID52, using XS++3.1