for CID53 : do you still have the sim card that came with the phone (France) ? if yes, then you can unlock it for free. Read here : Patching CID53 (DB2020)DB2010,2012 - Top Sony Forums and here : Remove SIM-lock patch generator - Page 118 - Top Sony Forums
For CID 52 : Read here : Flash your phone and How to apply or remove patch using SETool 2 Lite - Top Sony Forums
and here : Remove SIM-lock patch generator - Page 118 - Top Sony Forums (for CID52, there's no need to have the simcard that came with the phone