Need help for my K530i

[Baretta]

Hi seamonkey,
Thanks for the reply.
I was able to extract FS from your instruction and check the DEFAULT.xml contents, but wasn't able to find scripts that may correspond to User Agent string.

[This is what I got before]
SonyEricsson911T/R8BB Browser/NetFront/3.3Profile/MIDP-2.0Configuration//CLDC-1.1

[This is what I want]
SoftBank/1.0/911T/TJ002/SN[Serial Number] Browser/NetFront/3.3Profile/MIDP-2.0Configuration/CLDC-1.1

This time, I changed <phone-name> to "SoftBank/1.0/911T/TJ002/SN[Serial Number]".
To remove unnecessary letters, "SonyEricsson" and "R8BB", I wrote customize_upgrade.xml as below.
Removed "R8BB001" from <content-revision>, and "SonyEricsson" from <dm-account-name>

<?xml version="1.0" encoding="UTF-8"?>
<customization>
<info>
<phone-name>SoftBank/1.0/911T/TJ002/[Serial Number]</phone-name>
<content-revision></content-revision>
</info>
<fota>
<dm-account-name></dm-account-name>
</fota>
</customization>

[Result]
SonyEricssonSoftBank/1.0/911T/TJ002/SN[Serial Number]R8BB Browser/NetFront/3.3Profile/MIDP-2.0Configuration/CLDC-1.1

So the result shows that letters "SonyEricsson" and "R8BB" are coming from some other place.
As I walked through other files in the extracted FS, I couldn't find anything related.

Please someone help me to find where these letters are coming from.

Thank you.