Operator logo removal

[Hobbit]

Recently got a contract Nokia 6230 on vodafone. Managed to unlock OK using suitable unlock code. Wondered how easy it is to get rid of the vodafone logo that pops up every time you switch the phone on or off. Looked in various folders in the phone but cannot find the offending files(s) to remove. Anyone got any ideas?
Thanks

[Termy]

I think it is part of the flash. You would have to re-flash with unbranded firmware. That is if it is possible to find an unbranded flash for the 6230.