Congratulations on you new updated CID53 EROM, well we are not really happy with your CID53 phone but we could help you solve your problem. you need to patch unlock if you want it free of cost.
Read here on how to apply patch on CID53 phone : Patching CID53 (DB2020)DB2010,2012 - Top Sony Forums
and here to generate simlock patch for your phone : Remove SIM-lock patch generator - Top Sony Forums