Now you can backup GDFS on your DB2020 CID53 phone. like K790,K800,K810,K770 etc..
this software also support for security code reset.

XS++ 4.1 for linux supports CID53.

Note: CID53 supports only Linux version of XS++ 4.1. you can use ubuntu for this software.

Download XS++ 4.1 for linux from here: http://phonexs.com/?page=download