boab33:
It is okay what you did, but you need to apply the "unlock" patch too. Follow the steps II. and III. in DB2020 CID52 tutorial, located in first post of this thread.

fusi*n:
I was wondering if I could do the same with a k610i cid51 DB2020?
Yes you can unlock that phone. But first you need to upgrade the EROM CID to 52. How to do: connect the phone to XS++ v3.1, and when XS++ ask you if you want to upgrade the CID, press the YES button. After that unlock the phone following the DB2020 CID52 unlocking guide...