Unlocking DB2020 CID53 for FREE requires a sim card that the phone is locked to. If you have such a sim card and you can open the phone then you need to follow the Anycid procedure and use executor to break in, add the qapatch and unlock patch.
If you have no such sim card then I'm afraid it's a paid unlock only.
EDIT: You said you managed to apply some patches. I'd like to know how if you're asking if you can do it with XS?? Patching DB2020 CID53 can only be done with JDFlasher.