Congratulation for the new TV, i loved CX52 series and assure you will enjoy it
If possible try to update the software using LAN cable connection or USB memory stick.
The instructions are menioned step by step at the software download page
http://support.sony-europe.com/tvhc/downloads/downloads.aspx?site=odw_en_GB&f=FW_Bravia3407EUA&m=KDL-32CX523
The most important is to avoid any power disconnection during the update process.
Don't worry if your tv will automatically switched off , led blinking, tv restart during the update process
Thanks