For my UK Vodafone W595 I used:
<?xml version="1.0" encoding="utf-8" ?>
- <customization>
- <info>
<cda-number>1214-5668</cda-number>
</info>
</customization>
Initially it didn't work but the filename is case sensitive so must be "Customize_upgrade.xml", with a capital "C".
Also, be sure to turn the phone on and off again after copying "Customize_upgrade.xml".
Then, when you run SEUS it says that the most up to date software is already installed but instead of quoting the W595 VF LIVE software it quotes W595 WESTERN EUROPEAN and asks to reinstall anyway. Agree to reinstall anyway and this debrands it.