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There are lots of messages about uploading customize_upgrade.xml files on these forums. Many just contain the specific setting tweak needed to correct the problem.
Be sure you have the CDA and Version info also included or your phone won't talk to the Sony Update service for future updates OTA. You will continually get message stating "phone has latest updates".
Syntax for any update xml file should look similar to this (replacing model, cda-number and cda-revision as appropriate for your needs). This example is typical xml to allow YouTube to work with AT&T debranded phone.
<?xml version="1.0" encoding="UTF-8"?>
<customization>
<info>
<model>C905</model>
<cda-number>1214-7311</cda-number>
<cda-revision>R12A</cda-revision>
<phone-name>C905</phone-name>
</info>
<streaming>
<firewall-traversal-interval>15000</firewall-traversal-interval>
</streaming>
</customization>
If you are wondering if past action has messed your phone up .... get in the system info menu and if it says No CDA (under Customization Section) .... you need to correct.
Service Info Menu accessed by (from main screen) RT, * , Lt , Lt , * , Lt *
Bob H