BB 9720, can I update OS 7.1 to remove ex carrier Logo?

Hi, after days of reading I cannot find a specific fix for an issue I have...
So, does anyone know if it is possible for me to wipe an unlocked (but not factory unlocked 9720 - It's running on 02 but has Vodafone Branding on screen at start up and shut down) for my daughter and then, possibly using the App Loader, reinstall the standard BB OS7.1 so that it re-installs without the Vodafone branding?

I don't want to just plough ahead without knowing because for the last two weeks I have had the error screen 507 on my 9900 screen after attempting this very thing and no life in the phone whatsoever. I had a real tough time getting a new OS loaded, though with plenty of reading on the forum I think I've got there in the end.

I also have a curve 9320 that is factory unlocked with OS7.1 and I notice that the cod files are formatted completely differently from those in carrier specific models, even after they are unlocked to any network. What I would like to do if possible is to get the specific OS from my curve onto both my 9900 and my daughters 9720?

I hope I haven't over complicated my request but any advice would be really appreciated .

I don't think that there is an OS update that will rid of the logo. I've had two cellular devices that had that problem...

I'm thinking you may be right moonhacker. Ive tried and tried and tried and cannot manage to do what I want. I suppose the lesson is, if you want full control of your device, go for factory unlocked...