BB Curve :: Carrier Sign Still Showing After Wiping And Reloading

In my thread of "application installation issues", it seems to be determined that my carrier who I got the phone from, is blocking the install of applications as I get a 910 error, application authorization failure, when i try to install an application from: [URL]. After some searching, I've come across BBSAK, which I use to wipe the phone and reload the oS. I've also come across the tool "vendelete" which deletes the vendor.xml files.

So I do the following:
1. Uninstall the original carrier OS from pc.
2. Install OS from different carrier to pc.
3. Use vendelete to get rid of the xml files which it says no xml files were found.
4. Use bbsak to wipe the oS.
5. Reload the OS.

But when the phone boots up, it still shows the sign of the carrier which I don't want, so I presume nothing has been updated? since when I try to install the application again, I still get the 910 error.