If so, download the 8300 OS from this link: (I'm assuming you have an 8300 and not the 8310.) https://www.blackberry.com/Downloads...19656875EE557C
Install it to your PC.
Then go to c:\program files\common files\research in motion\apploader and delete the file callded "vendor.xml."
Once that's deleted, plug in the BB and in that same folder is a file called "Loader.exe.' Double click on that to reload the OS to the BB.