Top Sony are resellers of D-Unlocker. Brilliant little piece of software they can unlock any Se phone.
A1 A2, Db2020 etc
Go to the Se offical site and download your drivers from their for you phone.
You will also need usb flash drivers for use with se tools, xs++ and far Manager.
All the above can be found in our download section.
Regards
Lavondys
Top Sony Team