Hi Skeeve, you won't be able to remove the Optus logo splash screen that appears on power up or power down. You are able to load the Vodafone firmware onto your device which will give you the Vodafone theme. To do this you will have to follow these steps:
1. Install BlackBerry Desktop Manager from the CD that came with your device.
2. Download the latest Vodafone Australia firmware using this
LINK and install the firmware onto the PC which Desktop Manager is installed on.
3. Go to C
:\Program Files\Common Files\Research In Motion\AppLoader and rename
Vendor.xml to
Vendor.bak
4. Connect you BlackBerry device via USB to your computer and open BlackBerry Desktop Manager.
5. Once you device is detected a window should appear prompting you to upgrade your devices firmware.
6. Follow the prompts and upgrade you device firmware.
7. Once completed log onto your BlackBerry Web Client and select Resend Service Books.
If you have any questions before or after this procedure please let us know.
Thanks,
Gary